Journal articles: 'Plasmons (Physics)'

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Huang, Shenyang, Chaoyu Song, Guowei Zhang, and Hugen Yan. "Graphene plasmonics: physics and potential applications." Nanophotonics 6, no. 6 (October 18, 2016): 1191–204. http://dx.doi.org/10.1515/nanoph-2016-0126.

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AbstractPlasmon in graphene possesses many unique properties. It originates from the collective motion of massless Dirac fermions, and the carrier density dependence is distinctively different from conventional plasmons. In addition, graphene plasmon is highly tunable and shows strong energy confinement capability. Most intriguingly, as an atom-thin layer, graphene and its plasmon are very sensitive to the immediate environment. Graphene plasmons strongly couple to polar phonons of the substrate, molecular vibrations of the adsorbates, and lattice vibrations of other atomically thin layers. In this review, we present the most important advances in graphene plasmonics field. The topics include terahertz plasmons, mid-infrared plasmons, plasmon-phonon interactions, and potential applications. Graphene plasmonics opens an avenue for reconfigurable metamaterials and metasurfaces; it is an exciting and promising new subject in the nanophotonics and plasmonics research field.

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Allami, Hassan, and Jacob J. Krich. "Lossless plasmons in highly mismatched alloys." Applied Physics Letters 120, no. 25 (June 20, 2022): 252102. http://dx.doi.org/10.1063/5.0095766.

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We explore the potential of highly mismatched alloys (HMAs) for realizing lossless plasmonics. Systems with a plasmon frequency at which there are no interband or intraband processes possible are called lossless, as there is no two-particle loss channel for the plasmon. We find that the band splitting in HMAs with a conduction band anticrossing guarantees a lossless frequency window. When such a material is doped, producing plasmonic behavior, we study the conditions required for the plasmon frequency to fall in the lossless window, realizing lossless plasmons. Considering a generic class of HMAs with a conduction band anticrossing, we find universal contours in their parameter space within which lossless plasmons are possible for some doping range. Our analysis shows that HMAs with heavy effective masses and small high-frequency permittivity are most promising for realizing a lossless plasmonic material.

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Tao, Z. H., H. M. Dong, and Y. F. Duan. "Anomalous plasmon modes of single-layer MoS2." Modern Physics Letters B 33, no. 18 (June 26, 2019): 1950200. http://dx.doi.org/10.1142/s0217984919502002.

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The electronic plasmons of single layer MoS2 induced by different spin subbands owing to spin-orbit couplings (SOCs) are theoretically investigated. The study shows that two new and anomalous plasmonic modes can be achieved via inter-spin subband transitions around the Fermi level due to the SOCs. The plasmon modes are optic-like, which are very different from the plasmons reported recently in single-layer (SL) MoS2, and the other two-dimensional systems. The frequency of such plasmons ascends with the increasing of electron density or spin polarizability, and decreases with the increasing of wave vector. The promising plasmonic properties of SL MoS2 make it interesting for future applications in plasmonic and terahertz devices.

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Ramesh Narayan, Preethi, and Christin David. "Nonlocal Soft Plasmonics in Planar Homogeneous Multilayers." Photonics 10, no. 9 (September 7, 2023): 1021. http://dx.doi.org/10.3390/photonics10091021.

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Plasmonics is the study of resonant oscillations of free electrons in metals caused by incident electromagnetic radiation. Surface plasmons can focus and steer light on the subwavelength scale. Apart from metals, plasmonic phenomena can be observed in soft matter systems such as electrolytes which we study here. Resonant charge oscillations can be induced for ions in solution, however, due to their larger mass, they are plasmon-active in a lower frequency regime and on a larger wavelength scale. Our investigation focuses on spatial confinement which allows increasingly strong charge interactions and gives rise to nonlocality or spatial dispersion effects. We derive and discuss the nonlocal optical response of ionic plasmons using a hydrodynamic two-fluid model in a planar homogeneous three-layer system with electrolyte-dielectric interfaces. As in metals, we observe the emergence of additional longitudinal propagation modes in electrolytes which causes plasmonic broadening. Studying such systems enables us to identify and understand plasmonic phenomena in biological and chemical systems.

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Ye, Fan, Juan M. Merlo, Michael J. Burns, and Michael J. Naughton. "Optical and electrical mappings of surface plasmon cavity modes." Nanophotonics 3, no. 1-2 (April 1, 2014): 33–49. http://dx.doi.org/10.1515/nanoph-2013-0038.

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AbstractPlasmonics is a rapidly expanding field, founded in physics but now with a growing number of applications in biology (biosensing), nanophotonics, photovoltaics, optical engineering and advanced information technology. Appearing as charge density oscillations along a metal surface, excited by electromagnetic radiation (e.g., light), plasmons can propagate as surface plasmon polaritons, or can be confined as standing waves along an appropriately-prepared surface. Here, we review the latter manifestation, both their origins and the manners in which they are detected, the latter dominated by near field scanning optical microscopy (NSOM/SNOM). We include discussion of the “plasmonic halo” effect recently observed by the authors, wherein cavity-confined plasmons are able to modulate optical transmission through step-gap nanostructures, yielding a novel form of color (wavelength) selection.

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Ghalgaoui, Ahmed, and Klaus Reimann. "Excitation of tunable plasmons in silicon using microwave transmission through a metallic aperture." Applied Physics Letters 120, no. 16 (April 18, 2022): 162103. http://dx.doi.org/10.1063/5.0080262.

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Plasmon resonances in semiconductors at microwave frequencies offer the possibility for many functionalities and integration schemes. Semiconductor materials, such as germanium, gallium arsenide, and silicon, have the further advantage of being able to be integrated with standard electronics technology. Here, we probe the bulk plasmon modes in silicon in the vicinity of a copper plate perforated by a single aperture at frequencies between 10 and 60 GHz. Sharp transmission minima are observed at discrete frequencies. The observed frequencies depend on the size of the aperture and the carrier concentration in the silicon; they are well reproduced by the dispersion relation for bulk plasmons. Our results show that one can excite plasmons in silicon in the millimeter-wave region, opening a route to microwave plasmonics for large-scale applications, using low-cost technology.

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Sahai, Aakash A., Mark Golkowski, Stephen Gedney, Thomas Katsouleas, Gerard Andonian, Glen White, Joachim Stohr, et al. "PetaVolts per meter Plasmonics: introducing extreme nanoscience as a route towards scientific frontiers." Journal of Instrumentation 18, no. 07 (July 1, 2023): P07019. http://dx.doi.org/10.1088/1748-0221/18/07/p07019.

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Abstract A new class of plasmons has opened access to unprecedented PetaVolts per meter electromagnetic fields which can transform the paradigm of scientific and technological advances. This includes non-collider searches in fundamental physics in addition to making next generation colliders feasible. PetaVolts per meter plasmonics relies on this new class of plasmons uncovered by our work in the large amplitude limit of collective oscillations of quantum electron gas. This Fermi gas constituted by “free” conduction band electrons is inherent in conductive media endowed with a suitable combination of constituent atoms and ionic lattice structure. As this quantum gas of electrons can be as dense as 1024 cm-3, the coherence limit of plasmonic electromagnetic fields is extended in our model from the classical to the quantum domain, 0.1 √(n 0(1024 cm-3)) PVm-1. Appropriately engineered, structured materials that allow highly tunable material properties also make it possible to overcome disruptive instabilities that dominate the interactions in bulk media. The ultra-high density of conduction electrons and the existence of electronic energy bands engendered by the ionic lattice is only possible due to quantum mechanical effects. Based on this framework, it is critical to address various challenges that underlie PetaVolts per meter plasmonics including stable excitation of plasmons while accounting for their effects on the ionic lattice and the electronic energy band structure over femtosecond timescales. We summarize the challenges and ongoing efforts that set the strategy for the future. Extreme plasmonic fields can shape the future by not only opening the possibility of tens of TeV to multi-PeV center-of-mass-energies but also enabling novel pathways in non-collider HEP. In view of this promise, our efforts are dedicated to realization of the immense potential of PV/m plasmonics and its applications.

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Silva, Jaime, Bruce F. Milne, and Fernando Nogueira. "On the Single Wall Carbon Nanotube Surface Plasmon Stability." EPJ Web of Conferences 233 (2020): 05009. http://dx.doi.org/10.1051/epjconf/202023305009.

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The physics of surface plasmons has a long tradition in condensed matter theory but as the dimension of the systems reaches the nano scale, new effects appear. In this work, by calculating the absorption spectra of a single wall carbon nanotube, using time dependent density functional theory, the effect of adding/removing electrons on the surface plasmon energy is studied. It is shown that removing electrons from the single wall carbon nanotube does not affect the surface plasmon energy peak. In contrast, adding electrons to the single wall carbon nanotube will redshift the plasmonic peak energy, an effect that is explained by an increase of the electron effective mass.

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Wu, Yuyang, Peng Xie, Qi Ding, Yuhang Li, Ling Yue, Hong Zhang, and Wei Wang. "Magnetic plasmons in plasmonic nanostructures: An overview." Journal of Applied Physics 133, no. 3 (January 21, 2023): 030902. http://dx.doi.org/10.1063/5.0131903.

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The magnetic response of most natural materials, characterized by magnetic permeability, is generally weak. Particularly, in the optical range, the weakness of magnetic effects is directly related to the asymmetry between electric and magnetic charges. Harnessing artificial magnetism started with a pursuit of metamaterial design exhibiting magnetic properties. The first demonstration of artificial magnetism was given by a plasmonic nanostructure called split-ring resonators. Engineered circulating currents form magnetic plasmons, acting as the source of artificial magnetism in response to external electromagnetic excitation. In the past two decades, magnetic plasmons supported by plasmonic nanostructures have become an active topic of study. This Perspective reviews the latest studies on magnetic plasmons in plasmonic nanostructures. A comprehensive summary of various plasmonic nanostructures supporting magnetic plasmons, including split-ring resonators, metal–insulator–metal structures, metallic deep groove arrays, and plasmonic nanoclusters, is presented. Fundamental studies and applications based on magnetic plasmons are discussed. The formidable challenges and the prospects of the future study directions on developing magnetic plasmonic nanostructures are proposed.

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Морозов, М. Ю., И. М. Моисеенко, А. В. Коротченков, and В. В. Попов. "Замедление терагерцовых плазменных волн в конической структуре с графеном, накачиваемым с помощью оптических плазменных волн." Физика и техника полупроводников 55, no. 6 (2021): 518. http://dx.doi.org/10.21883/ftp.2021.06.50920.9525.

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Deceleration of terahertz (THz) plasma waves (plasmons) in tapered structure with graphene layer pumped by optical plasmons is studied theoretically. It is shown, that THz plasma wave is decelerated when moving toward the structure apex. Deceleration of THz plasmons in tapered structure with graphene layer pumped by optical plasmons is more efficient as compared to deceleration of THz plasmons in tapered structure with graphene screened by metal without pumping by optical plasmons for the same parameter values of the structure. The plasmon phase velocity near the taper apex can become an order of magnitude smaller as compared to that value in the input of the structure for achievable power densities of the optical plasmon.

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Zverevich, Dmitry, and Alex Levchenko. "Transport signatures of plasmon fluctuations in electron hydrodynamics." Low Temperature Physics 49, no. 12 (December 1, 2023): 1376–84. http://dx.doi.org/10.1063/10.0022363.

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In two-dimensional electron systems, plasmons are gapless and long-lived collective excitations of propagating charge density oscillations. We study the fluctuation mechanism of plasmon-assisted transport in the regime of electron hydrodynamics. We consider pristine electron liquids where charge fluctuations are thermally induced by viscous stresses and intrinsic currents, while attenuation of plasmons is determined by the Maxwell mechanism of charge relaxation. It is shown that, while the contribution of plasmons to the shear viscosity and thermal conductivity of a Fermi liquid is small, plasmon resonances in the bilayer devices enhance the drag resistance. In systems without Galilean invariance, fluctuation-driven contributions to dissipative coefficients can be described only in terms of hydrodynamic quantities: intrinsic conductivity, viscosity, and plasmon dispersion relation.

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Ding, Wen Jun, Jeremy Zhen Jie Lim, Hue Thi Bich Do, Xiao Xiong, Zackaria Mahfoud, Ching Eng Png, Michel Bosman, Lay Kee Ang, and Lin Wu. "Particle simulation of plasmons." Nanophotonics 9, no. 10 (June 17, 2020): 3303–13. http://dx.doi.org/10.1515/nanoph-2020-0067.

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AbstractParticle simulation has been widely used in studying plasmas. The technique follows the motion of a large assembly of charged particles in their self-consistent electric and magnetic fields. Plasmons, collective oscillations of the free electrons in conducting media such as metals, are connected to plasmas by very similar physics, in particular, the notion of collective charge oscillations. In many cases of interest, plasmons are theoretically characterized by solving the classical Maxwell’s equations, where the electromagnetic responses can be described by bulk permittivity. That approach pays more attention to fields rather than motion of electrons. In this work, however, we apply the particle simulation method to model the kinetics of plasmons, by updating both particle position and momentum (Newton–Lorentz equation) and electromagnetic fields (Ampere and Faraday laws) that are connected by current. Particle simulation of plasmons can offer insights and information that supplement those gained by traditional experimental and theoretical approaches. Specifically, we present two case studies to show its capabilities of modeling single-electron excitation of plasmons, tracing instantaneous movements of electrons to elucidate the physical dynamics of plasmons, and revealing electron spill-out effects of ultrasmall nanoparticles approaching the quantum limit. These preliminary demonstrations open the door to realistic particle simulations of plasmons.

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ZHOU, XIN, HONGJIAN LI, SHAOLI FU, SUXIA XIE, HAIQING XU, and JINJUN WU. "OPTICAL PROPERTIES AND PLASMON RESONANCE OF COUPLED GOLD NANOSHELL ARRAYS." Modern Physics Letters B 25, no. 02 (January 20, 2011): 109–18. http://dx.doi.org/10.1142/s0217984911025523.

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The optical properties and plasmon resonances coupling of ordered gold nanoshell arrays are investigated theoretically by means of finite-difference time-domain (FDTD) theory. We showed that the thickness, size and inter-shell distance of the nanoshells can tune the optical transmission of the system and the highly geometry-dependent plasmon response can be seen as an interaction between the essentially fixed-frequency plasmon response of a nanosphere and that of a nanocavity for the nanoshells. We also revealed the two different resonance modes by analyzing the spatial distributions of electric field component Ez. We proposed that the peaks of the lower energy mainly originate from the sphere plasmons coupling and the peaks of the higher energy are mainly attributed to the coupling between the sphere plasmons and the cavity plasmons.

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Karaballi, Reem A., Yashar Esfahani Monfared, Isobel C. Bicket, Robert H. Coridan, and Mita Dasog. "Solid-state synthesis of UV-plasmonic Cr₂N nanoparticles." Journal of Chemical Physics 157, no. 15 (October 21, 2022): 154706. http://dx.doi.org/10.1063/5.0109806.

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Materials that exhibit plasmonic response in the UV region can be advantageous for many applications, such as biological photodegradation, photocatalysis, disinfection, and bioimaging. Transition metal nitrides have recently emerged as chemically and thermally stable alternatives to metal-based plasmonic materials. However, most free-standing nitride nanostructures explored so far have plasmonic responses in the visible and near-IR regions. Herein, we report the synthesis of UV-plasmonic Cr2N nanoparticles using a solid-state nitridation reaction. The nanoparticles had an average diameter of 9 ± 5 nm and a positively charged surface that yields stable colloidal suspension. The particles were composed of a crystalline nitride core and an amorphous oxide/oxynitride shell whose thickness varied between 1 and 7 nm. Calculations performed using the finite element method predicted the localized surface plasmon resonance (LSPR) for these nanoparticles to be in the UV-C region (100–280 nm). While a distinctive LSPR peak could not be observed using absorbance measurements, low-loss electron energy loss spectroscopy showed the presence of surface plasmons between 80 and 250 nm (or ∼5 to 15 eV) and bulk plasmons centered around 50–62 nm (or ∼20 to 25 eV). Plasmonic coupling was also observed between the nanoparticles, resulting in resonances between 250 and 400 nm (or ∼2.5 to 5 eV).

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LIU, S. Q., and Y. LIU. "Kinetic theory of transverse plasmons in pair plasmas." Journal of Plasma Physics 77, no. 2 (April 16, 2010): 145–53. http://dx.doi.org/10.1017/s002237781000019x.

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AbstractA set of nonlinear governing equations for interactions of transverse plasmons with pair plasmas is derived from Vlasov–Maxwell equations. It is shown the ponderomotive force induced by high-frequency transverse plasmons will expel the pair particles away, resulting in the formation of density cavity in which transverse plasmons are trapped. Numerical results show the envelope of wave fields will collapse and break into a filamentary structure due to the spatially inhomogeneous growth rate. The results obtained would be useful for understanding the nonlinear propagation behavior of intense electromagnetic waves in pair plasmas.

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Maccaferri, Nicolò, Alessio Gabbani, Francesco Pineider, Terunori Kaihara, Tlek Tapani, and Paolo Vavassori. "Magnetoplasmonics in confined geometries: Current challenges and future opportunities." Applied Physics Letters 122, no. 12 (March 20, 2023): 120502. http://dx.doi.org/10.1063/5.0136941.

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Plasmonics represents a unique approach to confine and enhance electromagnetic radiation well below the diffraction limit, bringing a huge potential for novel applications, for instance, in energy harvesting, optoelectronics, and nanoscale biochemistry. To achieve novel functionalities, the combination of plasmonic properties with other material functions has become increasingly attractive. In this Perspective, we review the current state of the art, challenges, and future opportunities within the field of magnetoplasmonics in confined geometries, an emerging area aiming to merge magnetism and plasmonics to either control localized plasmons, confined electromagnetic-induced collective electronic excitations, using magnetic properties, or vice versa. We begin by highlighting the cornerstones of the history and principles of this research field. We then provide our vision of its future development by showcasing raising research directions in hybrid magnetoplasmonic systems to overcome radiation losses and novel materials for magnetoplasmonics, such as transparent conductive oxides and hyperbolic metamaterials. Finally, we provide an overview of recent developments in plasmon-driven magnetization dynamics, nanoscale opto-magnetism, and acousto-magnetoplasmonics. We conclude by giving our personal vision of the future of this thriving research field.

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Ogawa, Shinpei, Shoichiro Fukushima, and Masaaki Shimatani. "Graphene Plasmonics in Sensor Applications: A Review." Sensors 20, no. 12 (June 23, 2020): 3563. http://dx.doi.org/10.3390/s20123563.

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Surface plasmon polaritons (SPPs) can be generated in graphene at frequencies in the mid-infrared to terahertz range, which is not possible using conventional plasmonic materials such as noble metals. Moreover, the lifetime and confinement volume of such SPPs are much longer and smaller, respectively, than those in metals. For these reasons, graphene plasmonics has potential applications in novel plasmonic sensors and various concepts have been proposed. This review paper examines the potential of such graphene plasmonics with regard to the development of novel high-performance sensors. The theoretical background is summarized and the intrinsic nature of graphene plasmons, interactions between graphene and SPPs induced by metallic nanostructures and the electrical control of SPPs by adjusting the Fermi level of graphene are discussed. Subsequently, the development of optical sensors, biological sensors and important components such as absorbers/emitters and reconfigurable optical mirrors for use in new sensor systems are reviewed. Finally, future challenges related to the fabrication of graphene-based devices as well as various advanced optical devices incorporating other two-dimensional materials are examined. This review is intended to assist researchers in both industry and academia in the design and development of novel sensors based on graphene plasmonics.

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Yan, Xiaofei, Qi Lin, Lingling Wang, and Guidong Liu. "Active absorption modulation by employing strong coupling between magnetic plasmons and borophene surface plasmons in the telecommunication band." Journal of Applied Physics 132, no. 6 (August 14, 2022): 063101. http://dx.doi.org/10.1063/5.0100211.

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The tunable and highly confined plasmon in 2D materials paves the way for designing 2D materials capable of manipulating light on a subwavelength scale, making them suitable for the design of optical modulators in ultracompact sizes. Herein, a continuously adjustable modulator in the telecommunication band is theoretically presented by the strong coupling between the magnetic plasmons (MPs) and borophene surface plasmons (BSPs). A remarkable Rabi splitting is observed and the coupling process is theoretically investigated by the model of two coupled oscillators. Results show that the splitting energy is determined by the coupling strength, which can be modulated by adjusting the distance between the borophene monolayer and silver grating. Moreover, by manipulating the electron density of the borophene to drive both two modes coupled or decoupled, the absorption can be continuously adjustable almost from 0 to 1 at 1544 nm, and the maximum modulation depth can be up to 94.8%. This work may provide a method to enhance light–matter interactions by the coupled multi-modes and design borophene-based plasmonic modulator.

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Sun, Pengfei, Pengfei Xu, Kejian Zhu, and Zhiping Zhou. "Silicon-Based Optoelectronics Enhanced by Hybrid Plasmon Polaritons: Bridging Dielectric Photonics and Nanoplasmonics." Photonics 8, no. 11 (October 28, 2021): 482. http://dx.doi.org/10.3390/photonics8110482.

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Silicon-based optoelectronics large-scale integrated circuits have been of interest to the world in recent decades due to the need for higher complexity, larger link capacity, and lower cost. Surface plasmons are electromagnetic waves that propagate along the interface between a conductor and a dielectric, which can be confined several orders smaller than the wavelength in a vacuum and offers the potential for minimizing photonic circuits to the nanoscale. However, plasmonic waveguides are usually accompanied by substantial propagation loss because metals always exhibit significant resistive heating losses when interacting with light. Therefore, it is better to couple silicon-based optoelectronics and plasmonics and bridge the gap between micro-photonics and nanodevices, especially some nano-electronic devices. In this review, we discuss methods to enhance silicon-based optoelectronics by hybrid plasmon polaritons and summarize some recently reported designs. It is believed that by utilizing the strong light confinement of plasmonics, we can overcome the conventional diffraction limit of light and further improve the integration of optoelectronic circuits.

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Li, Shaobo, Shuming Yang, Fei Wang, Qiang Liu, Biyao Cheng, and Yossi Rosenwaks. "Plasmonic interference modulation for broadband nanofocusing." Nanophotonics 10, no. 16 (October 26, 2021): 4113–23. http://dx.doi.org/10.1515/nanoph-2021-0405.

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Abstract Metallic plasmonic probes have been successfully applied in near-field imaging, nanolithography, and Raman enhanced spectroscopy because of their ability to squeeze light into nanoscale and provide significant electric field enhancement. Most of these probes rely on nanometric alignment of incident beam and resonant structures with limited spectral bandwidth. This paper proposes and experimentally demonstrates an asymmetric fiber tip for broadband interference nanofocusing within its full optical wavelengths (500–800 nm) at the nanotip with 10 nm apex. The asymmetric geometry consisting of two semicircular slits rotates plasmonic polarization and converts the linearly polarized plasmonic mode to the radially polarized plasmonic mode when the linearly polarized beam couples to the optical fiber. The three-dimensional plasmonic modulation induces circumference interference and nanofocus of surface plasmons, which is significantly different from the nanofocusing through plasmon propagation and plasmon evolution. The plasmonic interference modulation provides fundamental insights into the plasmon engineering and has important applications in plasmon nanophotonic technologies.

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Osborne, I. S. "APPLIED PHYSICS: Imaging Surface Plasmons." Science 307, no. 5717 (March 25, 2005): 1841a. http://dx.doi.org/10.1126/science.307.5717.1841a.

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Полищук, О. В., Д. В. Фатеев, and В. В. Попов. "Особенности затухания и усиления терагерцовых плазмонных мод в графене с учетом пространственной дисперсии." Физика и техника полупроводников 55, no. 10 (2021): 850. http://dx.doi.org/10.21883/ftp.2021.10.51432.29.

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In this paper, we consider the effect of charge carrier drift on plasmon modes (plasmons) in electron Dirac liquid in graphene with a shifted Fermi level. Dispersion relations for plasmons were obtained using an electromagnetic approach and a hydrodynamic description of an electron liquid. Damped and amplified plasmon eigenmodes are studied numerically depending on the relationship of the magnitudes and directions of the direct electric current and the phase velocity of the plasmon.

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Guo, Zi-Zheng. "Effect of dielectric environment on plasmonic resonance absorption of graphene nanoribbon arrays." International Journal of Modern Physics B 32, no. 26 (October 18, 2018): 1850284. http://dx.doi.org/10.1142/s0217979218502843.

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The plasmonic resonance absorption properties of a periodic graphene nanoribbon array are studied in this paper. We discuss the effect of the asymmetricity of the dielectric environment on the plasmonic resonance of the graphene nanoribbon array in order to know which combination of the two dielectric materials surrounding the graphene is most advantageous. The results show that, regardless of the graphene in symmetric and asymmetrical environments, the absorption peak of plasmon resonance shifts to longer wavelengths (shifts red) with the increase of the changing permittivity (permittivities) on one or both sides. This absorption characteristic of the graphene periodic array to external electromagnetic waves originates from the wavelength dependence of the intrinsic graphene plasmons on the environmental medium.

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Khurgin, Jacob B. "Replacing noble metals with alternative materials in plasmonics and metamaterials: how good an idea?" Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, no. 2090 (March 28, 2017): 20160068. http://dx.doi.org/10.1098/rsta.2016.0068.

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Noble metals that currently dominate the fields of plasmonics and metamaterials suffer from large ohmic losses. Some of the new plasmonic materials, such as doped oxides and nitrides, have smaller material loss, and using them in place of metals carries the promise of reduced-loss plasmonic and metamaterial structures, with sharper resonances and higher field concentrations. This promise is put to a rigorous analytical test in this work, which reveals that having low material loss is not sufficient to have reduced modal loss in plasmonic structures. To reduce the modal loss, it is absolutely necessary for the plasma frequency to be significantly higher than the operational frequency. Using examples of nanoparticle plasmons and gap plasmons one comes to the conclusion that, even in the mid-infrared spectrum, metals continue to hold an advantage over alternative media when it comes to propagation distances and field enhancements. Of course, the new materials still have an application niche where high absorption loss is beneficial, e.g. in medicine and thermal photovoltaics. This article is part of the themed issue ‘New horizons for nanophotonics’.

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Mukubwa, Abel, and John Wanjala Makokha. "Plasmon Mediation of Charge Pairing in High Temperature Superconductors." Advances in Condensed Matter Physics 2021 (December 28, 2021): 1–6. http://dx.doi.org/10.1155/2021/7234840.

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A Bose-Einstein condensate (BEC) of a nonzero momentum Cooper pair constitutes a composite boson or simply a boson. We demonstrated that the quantum coherence of the two-component BEC (boson and fermion condensates) is controlled by plasmons. It has been proposed that plasmons, observed in both electron-doped and hole-doped cuprates, originates from the long-range Coulomb screening, where the transfer momentum q ⟶ 0 . We further show that the screening mediates boson-fermion pairing at condensate state. While only about 1 % of plasmon energy mediates the charge pairing, most of the plasmon energy is used to overcome the modes that compete against superconductivity such as phonons, charge density waves, antiferromagnetism, and damping effects. Additionally, the dependence of frequency of plasmons on the material of a superconductor is also explored. This study gives a quantum explanation of the modes that enhance and those that inhibit superconductivity. The study informs the nature of electromagnetic radiations (EMR) that can enhance the critical temperature of such materials.

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Intravaia, F., and A. Lambrecht. "The Role of Surface Plasmon Modes in the Casimir Effect." Open Systems & Information Dynamics 14, no. 02 (June 2007): 159–68. http://dx.doi.org/10.1007/s11080-007-9044-4.

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In this paper, we study the role of surface plasmon modes in the Casimir effect. First we write the Casimir energy as the sum over the modes of a real cavity. We may identify two sorts of modes, two evanescent surface plasmon modes and propagative modes. As one of the surface plasmon modes becomes propagative for some choice of parameters we adopt an adiabatic mode definition where we follow this mode into the propagative sector and count it together with the surface plasmon contribution, calling this contribution “plasmonic”. The remaining modes are propagative cavity modes, which we call “photonic”. The Casimir energy contains two main contributions, one coming from the plasmonic, the other from the photonic modes. Surprisingly we find that the plasmonic contribution to the Casimir energy becomes repulsive for intermediate and large mirror separations. Alternatively, we discuss the common surface plasmon defintion, which includes only evanescent waves, where this effect is not found. We show that, in contrast to an intuitive expectation, for both definitions the Casimir energy is the sum of two very large contributions which nearly cancel each other. The contribution of surface plasmons to the Casimir energy plays a fundamental role not only at short but also at large distances.

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ZHANG, F. S., F. WANG, and Y. ABE. "HARMONIC GENERATIONS OF CLUSTER Na2 IN ULTRASHORT INTENSE LASER PULSES." International Journal of Modern Physics B 19, no. 15n17 (July 10, 2005): 2687–92. http://dx.doi.org/10.1142/s0217979205031535.

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In the framework of the time dependent local density approximation the harmonic generation of Na2 in ultrashort intense pulses is investigated. The coupling between harmonics and plasmons of Na 2 is discussed in detail with two laser frequencies 5.266 eV, which is double the resonance of the plasmon, and 1.124 eV, which is half the frequency of plasmons, and with two different peak intensities. One finds appearance of the third and the fifth harmonic generation at high ponderomotive potential.

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Zagorodnev, Igor V., Andrey A. Zabolotnykh, Danil A. Rodionov, and Vladimir A. Volkov. "Two-Dimensional Plasmons in Laterally Confined 2D Electron Systems." Nanomaterials 13, no. 6 (March 8, 2023): 975. http://dx.doi.org/10.3390/nano13060975.

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The collective oscillations of charge density (plasmons) in conductive solids are basic excitations that determine the dynamic response of the system. In infinite two-dimensional (2D) electron systems, plasmons have gapless dispersion covering a broad spectral range from subterahertz to infrared, which is promising in light-matter applications. We discuss the state-of-the-art physics of 2D plasmons, especially in confined 2D electron systems in stripe and disk geometry, using the simplest approach for conductivity. When the metal gate is placed in the vicinity of the 2D electron system, an analytical description of the plasmon frequency and damping can be easily obtained. We also analyze gated plasmons in the disk when it was situated at various distances from the gate, and discuss in detail the nontrivial behavior of the damping. We predict that it is not a simple sum of the radiative and collisional dampings, but has a nonmonotonic dependence on the system parameters. For high-mobility 2D systems, this opens the way to achieve the maximal quality factor of plasma resonances. Lastly, we discuss the recently discovered near-gate 2D plasmons propagating along the laterally confined gate, even without applied bias voltage and having gapless dispersion when the gate has the form of a stripe, and discrete spectrum when the gate is in the form of disk. It allows for one to drive the frequency and spatial propagation of such plasmons.

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Zotov, A. A., and N. V. Zverev. "Longitudinal Plasmons in a Thin Flat Conductive Film." Journal of Physics: Conference Series 2056, no. 1 (October 1, 2021): 012020. http://dx.doi.org/10.1088/1742-6596/2056/1/012020.

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Abstract The longitudinal plasmons in the plasma of conductivity electrons between the surfaces of a thin flat conductive film are investigated. It is shown that these plasmons lead to a resonant behaviour of the optical power coefficient of E-wave interaction with this film. The conditions for appearance of these plasmon resonances are found, and peculiarities of the dependence of the resonant frequencies on the film characteristics are revealed.

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COELLO, VICTOR. "SURFACE PLASMON POLARITON LOCALIZATION." Surface Review and Letters 15, no. 06 (December 2008): 867–79. http://dx.doi.org/10.1142/s0218625x08011974.

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Localization of surface plasmons polariton is reviewed in the context of experiments and modeling of near-field optical images. Near-field imaging of elastic (in-plane) surface plasmon scattering is discussed, and approaches for the correct image interpretation are outlined. Nonlinear effects related to localized surface plasmons are pressented. Surface plasmon localization opens up numerous possibilities for application in biosensing, nanophotonics, and in general in the area of surface optics properties.

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31

Boyd, T. J. M. "Laser–plasma interaction physics in underdense coronal plasmas." Canadian Journal of Physics 64, no. 8 (August 1, 1986): 944–55. http://dx.doi.org/10.1139/p86-163.

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After a brief review of stimulated Raman scattering and two-plasmon decay, which dominate the physics of laser–plasma interactions at and below the quarter-critical density, we summarize some of the principal characteristics of emission from targets at half-harmonics of the laser frequency. Two mechanisms in particular are thought to contribute to the emission; Raman conversion and the direct linear conversion of plasmons generated by two-plasmon decay. Both processes are reviewed and the implications of each for the emission spectra examined.The effect of strong self-generated magnetic fields on harmonic generation is considered briefly and attention is drawn to ways in which the coincidence of interactions in the underdense plasma may influence their basic characteristics. A finite-amplitude ion wave, for example, modifies the spectrum of Raman scattered light, including significant frequency splitting.

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32

Locarno, Marco, and Daan Brinks. "Analytical calculation of plasmonic resonances in metal nanoparticles: A simple guide." American Journal of Physics 91, no. 7 (July 1, 2023): 538. http://dx.doi.org/10.1119/5.0094967.

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Localized surface plasmons (LSPs) in metal particles are used in medical, chemical, physical, and biological sensing applications. In this paper, we revisit the classical description of LSPs. We use the Drude model and the Quasi-Static approximation to describe the plasmon resonances in terms of the material and the size of the particles embedded in a dielectric host. We then incorporate the Clausius–Mossotti relation to include shape effects in the classical description. Finally, we incorporate surface damping and retardation effects to arrive at a unified, classical description providing an intuitive and realistic model of plasmonic resonances in metal particles.

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Mondal, Monosij, Maicol A. Ochoa, Maxim Sukharev, and Abraham Nitzan. "Coupling, lifetimes, and “strong coupling” maps for single molecules at plasmonic interfaces." Journal of Chemical Physics 156, no. 15 (April 21, 2022): 154303. http://dx.doi.org/10.1063/5.0077739.

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The interaction between excited states of a molecule and excited states of a metal nanostructure (e.g., plasmons) leads to hybrid states with modified optical properties. When plasmon resonance is swept through molecular transition frequency, an avoided crossing may be observed, which is often regarded as a signature of strong coupling between plasmons and molecules. Such strong coupling is expected to be realized when 2|⟨ U⟩|/ ℏΓ > 1, where ⟨ U⟩ and Γ are the molecule–plasmon coupling and the spectral width of the optical transition, respectively. Because both ⟨ U⟩ and Γ strongly increase with decreasing distance between a molecule and a plasmonic structure, it is not obvious that this condition can be satisfied for any molecule–metal surface distance. In this work, we investigate the behavior of ⟨ U⟩ and Γ for several geometries. Surprisingly, we find that if the only contributions to Γ are lifetime broadenings associated with the radiative and nonradiative relaxation of a single molecular vibronic transition, including effects on molecular radiative and nonradiative lifetimes induced by the metal, the criterion 2|⟨ U⟩|/ ℏΓ > 1 is easily satisfied by many configurations irrespective of the metal–molecule distance. This implies that the Rabi splitting can be observed in such structures if other sources of broadening are suppressed. Additionally, when the molecule–metal surface distance is varied keeping all other molecular and metal parameters constant, this behavior is mitigated due to the spectral shift associated with the same molecule–plasmon interaction, making the observation of Rabi splitting more challenging.

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SHARMA, A. C. "PLASMONS IN GaAs/AlxGa1−xAs SUPERLATTICE STRUCTURE: A MODEL STUDY." Modern Physics Letters B 05, no. 06 (March 10, 1991): 455–63. http://dx.doi.org/10.1142/s0217984991000538.

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We present analytic results for the effective interaction potential, plasmon dispersion relations and plasmon line shapes for the intrasubband plasmons in a modulation doped GaAs/Al x Ga 1−x As superlattice structure which contains two Al x Ga 1−x As layers of unequal widths per unit cell. Two intrasubband plasmon modes are found in the superlattice structure. One of the plasmon modes remains acoustic in nature while the other does not for all possible values of the wavevector.

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MENDONÇA, J. T., A. SERBETO, and S. ALI. "Effective charge of photons and plasmons." Journal of Plasma Physics 76, no. 3-4 (January 8, 2010): 287–92. http://dx.doi.org/10.1017/s002237780999047x.

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AbstractWe review the concept of photon effective charge in a plasma, and extend it to the case of longitudinal photons or plasmons. A simple electrostatic fluid model is considered in a non-magnetized and non-relativistic plasma. The contribution of the ions to the plasmon charge is also considered.

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Kosobukin, V. A. "Plasmon-excitonic polaritons in metal-semiconductor nanostructures with quantum wells." Физика и техника полупроводников 52, no. 5 (2018): 502. http://dx.doi.org/10.21883/ftp.2018.05.45846.35.

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AbstractA theory of plasmon-exciton coupling and its spectroscopy is developed for metal-semiconductor nanostructures. Considered as a model is a periodic superlattice with cells consisting of a quantum well and a layer of metal nanoparticles. The problem is solved self-consistently using the electrodynamic Green’s functions taking account of resonant polarization. Coulomb plasmon-exciton interaction is associated with the dipole surface plasmons of particles and their image charges due to excitonic polarization of neighboring quantum well. Optical reflection spectra are numerically investigated for superlattices with GaAs/AlGaAs quantum wells and silver nanoparticles. Superradiant regime caused by one-dimensional Bragg diffraction is studied for plasmonic, excitonic and plasmon-excitonic polaritons depending on the number of supercells. The plasmon-excitonic Rabi splitting is shown to occur in reflectivity spectra of resonant Bragg structures.

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37

Osborne, I. "APPLIED PHYSICS: Plasmons Go the Distance." Science 312, no. 5781 (June 23, 2006): 1717b. http://dx.doi.org/10.1126/science.312.5781.1717b.

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Osborne, I. S. "APPLIED PHYSICS: Plasmons on a Wire." Science 319, no. 5866 (February 22, 2008): 1011c. http://dx.doi.org/10.1126/science.319.5866.1011c.

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Zimnyakova, Polina E., Daria O. Ignatyeva, Andrey N. Kalish, Xiufeng Han, and Vladimir I. Belotelov. "Plasmonic dichroism and all-optical magnetization switching in nanophotonic structures with GdFeCo." Optics Letters 47, no. 23 (November 15, 2022): 6049. http://dx.doi.org/10.1364/ol.472046.

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We report on a phenomenon of plasmonic dichroism observed in magnetic materials with transverse magnetization under excitation of surface plasmon polariton waves. The effect originates from the interplay of the two magnetization-dependent contributions to the material absorption, both of which are enhanced under plasmon excitation. Plasmonic dichroism is similar to circular magnetic dichroism, which is at the base of all-optical helicity-dependent switching (AO-HDS) but observed for linearly polarized light, and the dichroism acts upon in-plane magnetized films, where AO-HDS does not take place. We show by electromagnetic modeling that laser pulses exciting counter-propagating plasmons can be used to write +M or −M states in a deterministic way independent of the initial magnetization state. The presented approach applies to various ferrimagnetic materials with in-plane magnetization, exhibiting the phenomenon of all-optical switching of a thermal nature and broadens the horizons of their applications in data storage devices.

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40

Milekhin, Ilya A., Sergei A. Kuznetsov, Ekaterina E. Rodyakina, Alexander G. Milekhin, Alexander V. Latyshev, and Dietrich R. T. Zahn. "Localized surface plasmons in structures with linear Au nanoantennas on a SiO2/Si surface." Beilstein Journal of Nanotechnology 7 (October 26, 2016): 1519–26. http://dx.doi.org/10.3762/bjnano.7.145.

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The study of infrared absorption by linear gold nanoantennas fabricated on a Si surface with underlying SiO2 layers of various thicknesses allowed the penetration depth of localized surface plasmons into SiO2 to be determined. The value of the penetration depth derived experimentally (20 ± 10 nm) corresponds to that obtained from electromagnetic simulations (12.9–30.0 nm). Coupling between plasmonic excitations of gold nanoantennas and optical phonons in SiO2 leads to the appearance of new plasmon–phonon modes observed in the infrared transmission spectra the frequencies of which are well predicted by the simulations.

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41

Ohon, Natalia, Tetiana Bulavinets, Iryna Yaremchuk, and Rostyslav Lesyuk. "Plasmon-Exciton Interaction in Perspective Hetero-Systems." East European Journal of Physics, no. 4 (December 6, 2022): 6–22. http://dx.doi.org/10.26565/2312-4334-2022-4-01.

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Surface plasmons and excitons have been widely studied experimentally and theoretically for various material systems. However, a number of aspects require further deeper study and understanding, among which the connection of these quasi-particles occupies an important place. New physical effects arise when plasmons and excitons in nanostructures begin to be localized at certain small distances, as a result, we can talk about their coupling. Complex systems containing the excitation of plasmons and excitons, as well as their coupling, show interesting optical properties that they cannot exhibit individually. In this type of system, the plasmon enhances the coupling between the system and the external field, and the exciton controls certain spectral properties, which opens up new possibilities for tuning their optical response. The transferred energy between plasmons and excitons becomes an important factor affecting their interaction when the resonance frequency of the localized plasmon is very close to the molecular energy transition frequency. Two types of coupling can occur depending on the ratio between the strength of the coupling and the energy losses of individual components in the system, namely strong and weak. In addition to the mutual coupling between the plasmon and the exciton, their different linewidths and ability to couple to an external field provide a variety of means to tune the optical properties of hybrid systems. Thus, it enables precise control of light at the nanometer scale, opening up possibilities for new electronics and photonics applications. In this review, we highlight the features of weak and strong modes of plasmon-exciton coupling, modern trends, and perspectives in the study of hetero-systems semiconductor–metal, metal–2D material, semiconductor–molecule, etc. Semiconductor-metal hybrid nanostructures open up exciting opportunities for the study of quantum phenomena, optical processes, and multiparticle interactions and confidently lead to application in new photonics devices.

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Odom, Teri W. "Materials Screening and Applications of Plasmonic Crystals." MRS Bulletin 35, no. 1 (January 2010): 66–73. http://dx.doi.org/10.1557/mrs2010.618.

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AbstractSurface plasmon polaritons are responsible for various optical phenomena, including negative refraction, enhanced optical transmission, and nanoscale focusing. Although many materials support plasmons, the choice of metal for most applications has been based on traditional plasmonic materials, such as Ag and Au, because there have been no side-by-side comparisons of different materials on well-defined, nanostructured surfaces. This article will describe how a multiscale patterning approach based on soft interference lithography can be used to create plasmonic crystals with different unit cell shapes—circular holes or square pyramids—which can be used as a platform to screen for new materials. The dispersion diagrams of plasmonic crystals made from unconventional metals will be presented, and the implications of discovering new optical coupling mechanisms and protein-sensing substrates based on Pd will be described. Finally, the opportunities enabled by this plasmonic library to dial into specific resonances for any angle or material will be discussed.

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LUO, XIANGANG, HAO WANG, JIEPING SHI, and HANMIN YAO. "LIGHT PROPAGATION THROUGH UNPERFORATED METALLIC STRUCTURE: PLASMON RESONANCE INDUCED TRANSPARENCY." Modern Physics Letters B 18, no. 23 (October 10, 2004): 1181–88. http://dx.doi.org/10.1142/s0217984904007682.

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The transmission properties of rectangular one-dimensional unperforated metallic periodic structures for frequencies close to the surface plasmon band are investigated experimentally and theoretically. The results reveal that it is possible to obtain unexpectedly large transmissions through thick unperforated metallic structures. The mechanisms of enhanced transmissions are attributed to resonant excitations of three kinds of plasmon radiations: coupled surface plasmon polaritons, horizontal localized groove plasmon mode, and vertical localized groove plasmons mode. Once the surface plasmon polaritons and the vertical groove plasmon modes are excited simultaneously, the transmission approaches to maximum at the coincident condition.

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Bratschitsch, R., W. Fischler, R. Höpfel, and G. Zandler. "Coherent THz Plasmons in GaAs: Transition from “Pure” Plasmons to Coupled Plasmon–Phonon Modes." physica status solidi (b) 204, no. 1 (November 1997): 64–66. http://dx.doi.org/10.1002/1521-3951(199711)204:1<64::aid-pssb64>3.0.co;2-9.

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45

Kuwahara, Makoto, Lira Mizuno, Rina Yokoi, Hideo Morishita, Takafumi Ishida, Koh Saitoh, Nobuo Tanaka, Shota Kuwahara, and Toshihide Agemura. "Transient electron energy-loss spectroscopy of optically stimulated gold nanoparticles using picosecond pulsed electron beam." Applied Physics Letters 121, no. 14 (October 3, 2022): 143503. http://dx.doi.org/10.1063/5.0108266.

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Ultrafast phenomena in gold nanotriangles (AuNTs) were investigated using a transient electron energy-loss spectroscopy (TEELS) technique under irradiation from a 150-fs pulse laser with a wavelength of 780 nm. This investigation was conducted using a time-resolved transmission electron microscopy method that was developed to measure the dynamics of nanomaterials. Enhancement of the intensity and energy-width broadening of the energy loss were observed at the EEL peaks associated with surface and bulk plasmons on the AuNTs. The TEELS measurement revealed two decay processes of 7.8 ps and longer than 100 ps that compensate for relaxation times of excited surface plasmons using transient absorption spectroscopy. The results show that the bulk and surface plasmons have the same time evolution, i.e., that the excited electrons on the surface and in the bulk have the same relaxation processes in both electron–phonon and phonon–phonon interactions. The time evolution of electronic and lattice temperatures was also estimated based on the measured relaxation time using a two-temperature model, which revealed the volume expansion of the AuNTs and clarified the energy shifts of plasmons. Details of excited electrons in nanoparticles investigated via plasmon energy loss are expected to facilitate improvement in the performance for energy harvesting of photons in nanostructure-controlled materials.

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Pitarke, J. M., V. M. Silkin, E. V. Chulkov, and P. M. Echenique. "Theory of surface plasmons and surface-plasmon polaritons." Reports on Progress in Physics 70, no. 1 (December 7, 2006): 1–87. http://dx.doi.org/10.1088/0034-4885/70/1/r01.

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Li, Zhiguo, Qiang Zhao, Pingping Chen, and Jiqing Wang. "Modulation and optimization of terahertz absorption in micro-cavity quantum well structures by graphene grating." Journal of Physics D: Applied Physics 55, no. 16 (January 21, 2022): 165104. http://dx.doi.org/10.1088/1361-6463/ac3fe0.

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Abstract Metal–insulator–metal-based plasmonic microcavities have attracted widespread interest due to their ability to manipulate and concentrate photons on the sub-wavelength scale. However, noble metals suffer from large intrinsic loss and lack active tunability. Here, a micro-cavity structure of a quantum well sandwiched between a periodic top contact of graphene grating and a bottom contact of graphene is proposed. Graphene plasmons provide a suitable alternative for metal plasmons and have the advantage of being highly tunable by electrostatic gating. The effect of changes in both the physical graphene and the device’s structural parameters on optimized absorption performance is systematically analyzed through the calculation of reflectivity curves of incident light. Our results indicate that the intersubband absorption of the device can be improved by adjusting the parameters of both the graphene material and the device structure. Furthermore, the cavity resonant mode excited by surface plasmon polaritons can be tuned to the response frequency of the quantum well under optimized parameters. Intersubband absorption is almost 1.5 times higher than that of a micro-cavity structure that uses metal grating.

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Park, Daniel J., Jessie C. Ku, Lin Sun, Clotilde M. Lethiec, Nathaniel P. Stern, George C. Schatz, and Chad A. Mirkin. "Directional emission from dye-functionalized plasmonic DNA superlattice microcavities." Proceedings of the National Academy of Sciences 114, no. 3 (January 4, 2017): 457–61. http://dx.doi.org/10.1073/pnas.1619802114.

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Three-dimensional plasmonic superlattice microcavities, made from programmable atom equivalents comprising gold nanoparticles functionalized with DNA, are used as a testbed to study directional light emission. DNA-guided nanoparticle colloidal crystallization allows for the formation of micrometer-scale single-crystal body-centered cubic gold nanoparticle superlattices, with dye molecules coupled to the DNA strands that link the particles together, in the form of a rhombic dodecahedron. Encapsulation in silica allows one to create robust architectures with the plasmonically active particles and dye molecules fixed in space. At the micrometer scale, the anisotropic rhombic dodecahedron crystal habit couples with photonic modes to give directional light emission. At the nanoscale, the interaction between the dye dipoles and surface plasmons can be finely tuned by coupling the dye molecules to specific sites of the DNA particle-linker strands, thereby modulating dye–nanoparticle distance (three different positions are studied). The ability to control dye position with subnanometer precision allows one to systematically tune plasmon–excition interaction strength and decay lifetime, the results of which have been supported by electrodynamics calculations that span length scales from nanometers to micrometers. The unique ability to control surface plasmon/exciton interactions within such superlattice microcavities will catalyze studies involving quantum optics, plasmon laser physics, strong coupling, and nonlinear phenomena.

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Wang, Sheng, SeokJae Yoo, Sihan Zhao, Wenyu Zhao, Salman Kahn, Dingzhou Cui, Fanqi Wu, et al. "Gate-tunable plasmons in mixed-dimensional van der Waals heterostructures." Nature Communications 12, no. 1 (August 19, 2021). http://dx.doi.org/10.1038/s41467-021-25269-0.

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AbstractSurface plasmons, collective electromagnetic excitations coupled to conduction electron oscillations, enable the manipulation of light–matter interactions at the nanoscale. Plasmon dispersion of metallic structures depends sensitively on their dimensionality and has been intensively studied for fundamental physics as well as applied technologies. Here, we report possible evidence for gate-tunable hybrid plasmons from the dimensionally mixed coupling between one-dimensional (1D) carbon nanotubes and two-dimensional (2D) graphene. In contrast to the carrier density-independent 1D Luttinger liquid plasmons in bare metallic carbon nanotubes, plasmon wavelengths in the 1D-2D heterostructure are modulated by 75% via electrostatic gating while retaining the high figures of merit of 1D plasmons. We propose a theoretical model to describe the electromagnetic interaction between plasmons in nanotubes and graphene, suggesting plasmon hybridization as a possible origin for the observed large plasmon modulation. The mixed-dimensional plasmonic heterostructures may enable diverse designs of tunable plasmonic nanodevices.

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Kim, San, Tae-In Jeong, Jongkyoon Park, Marcelo F. Ciappina, and Seungchul Kim. "Recent advances in ultrafast plasmonics: from strong field physics to ultraprecision spectroscopy." Nanophotonics, March 21, 2022. http://dx.doi.org/10.1515/nanoph-2021-0694.

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Abstract Surface plasmons, the collective oscillation of electrons, enable the manipulation of optical fields with unprecedented spatial and time resolutions. They are the workhorse of a large set of applications, such as chemical/biological sensors or Raman scattering spectroscopy, to name only a few. In particular, the ultrafast optical response configures one of the most fundamental characteristics of surface plasmons. Thus, the rich physics about photon–electron interactions could be retrieved and studied in detail. The associated plasmon-enhanced electric fields, generated by focusing the surface plasmons far beyond the diffraction limit, allow reaching the strong field regime with relatively low input laser intensities. This is in clear contrast to conventional optical methods, where their intrinsic limitations demand the use of large and costly laser amplifiers, to attain high electric fields, able to manipulate the electron dynamics in the non-linear regime. Moreover, the coherent plasmonic field excited by the optical field inherits an ultrahigh precision that could be properly exploited in, for instance, ultraprecision spectroscopy. In this review, we summarize the research achievements and developments in ultrafast plasmonics over the last decade. We particularly emphasize the strong-field physics aspects and the ultraprecision spectroscopy using optical frequency combs.

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Journal articles on the topic 'Plasmons (Physics)'

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