Artykuły w czasopismach: „Chiral Plasmonic Nano Shells”

1

Valagiannopoulos, Constantinos, S. Ali Hassani Gangaraj i Francesco Monticone. "Zeeman gyrotropic scatterers". Nanomaterials and Nanotechnology 8 (1.01.2018): 184798041880808. http://dx.doi.org/10.1177/1847980418808087.

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Anomalous scattering effects (invisibility, superscattering, Fano resonances, etc) enabled by complex media and metamaterials have been the subject of intense efforts in the past couple of decades. In this article, we present a full analysis of the unusual and extreme scattering properties of an important class of complex scatterers, namely, gyrotropic cylindrical bodies, including both homogeneous and core–shell configurations. Our study unveils a number of interesting effects, including Zeeman splitting of plasmonic scattering resonances, tunable gyrotropy-induced rotation of dipolar radiation patterns as well as extreme Fano resonances and non-radiating eigenmodes (embedded eigenstates) of the gyrotropic scatterer. We believe that these theoretical findings may enable new opportunities to control and tailor scattered fields beyond what is achievable with isotropic reciprocal objects, being of large significance for different applications, from tunable directive nano-antennas to selective chiral sensors and scattering switches, as well as in the context of nonreciprocal and topological metamaterials.

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Zakomirnyi, Vadim I., Ilia L. Rasskazov, Lasse K. Sørensen, P. Scott Carney, Zilvinas Rinkevicius i Hans Ågren. "Plasmonic nano-shells: atomistic discrete interaction versus classic electrodynamics models". Physical Chemistry Chemical Physics 22, nr 24 (2020): 13467–73. http://dx.doi.org/10.1039/d0cp02248a.

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Using the extended discrete interaction model and Mie theory, we investigate the tunability of the optical polarizability and show the size-dependence of the plasma frequency of small metallic nano-shells in the 1–15 nm size region.

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Csernai, L. P., N. Kroo i I. Papp. "Radiation dominated implosion with nano-plasmonics". Laser and Particle Beams 36, nr 2 (czerwiec 2018): 171–78. http://dx.doi.org/10.1017/s0263034618000149.

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AbstractInertial Confinement Fusion is a promising option to provide massive, clean, and affordable energy for mankind in the future. The present status of research and development is hindered by hydrodynamical instabilities occurring at the intense compression of the target fuel by energetic laser beams. A recent patent combines advances in two fields: Detonations in relativistic fluid dynamics (RFD) and radiative energy deposition by plasmonic nano-shells. The initial compression of the target pellet can be decreased, not to reach the Rayleigh–Taylor or other instabilities, and rapid volume ignition can be achieved by a final and more energetic laser pulse, which can be as short as the penetration time of the light across the pellet. The reflectivity of the target can be made negligible as in the present direct drive and indirect drive experiments, and the absorptivity can be increased by one or two orders of magnitude by plasmonic nano-shells embedded in the target fuel. Thus, higher ignition temperature and radiation dominated dynamics can be achieved with the limited initial compression. Here, we propose that a short final light pulse can heat the target so that most of the interior will reach the ignition temperature simultaneously based on the results of RFD. This makes the development of any kind of instability impossible, which would prevent complete ignition of the target.

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Klös, Gunnar, Amanda Andersen, Matteo Miola, Henrik Birkedal i Duncan S. Sutherland. "Oxidation controlled lift-off of 3D chiral plasmonic Au nano-hooks". Nano Research 12, nr 7 (24.04.2019): 1635–42. http://dx.doi.org/10.1007/s12274-019-2412-x.

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Amboli, Jayeeta, Guillaume Demésy, Bruno Galas i Nicolas Bonod. "Numerical investigation of far-field circular dichroism and local chiral response of pseudo-chiral meta-surface with FEM". EPJ Web of Conferences 266 (2022): 05001. http://dx.doi.org/10.1051/epjconf/202226605001.

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Circular dichroism spectroscopy is a sensitive and widely applied technique to detect chiral molecules. Recent studies have shown high prospects for plasmonic metasurfaces of pseudo-chiral nano-resonators in enhancing chiral sensitivity. Here we study the far-field circular dichroism for gold U-shaped metasurfaces by calculating Mueller matrix elements with the Finite element method and investigate its response in light of the near field electric energy and optical chiral density.

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6

Yadav, Vikas, i Soumik Siddhanta. "Engineering chiral plasmonic nanostructures for gain-assisted plasmon amplification and tunable enhancement of circular dichroism". Materials Advances 3, nr 3 (2022): 1825–33. http://dx.doi.org/10.1039/d1ma01067k.

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We have demonstrated that the SPASER configuration can provide giant chiroptical enhancements in plasmonic nano assemblies within the lasing threshold which can be harnessed for highly efficient chiral sensing or imaging of complex biological environments.

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Tatsuma, Tetsu, Takuya Ishida i Hiroyasu Nishi. "(Invited) Photoelectrochemical Fabrication of Chiral Plasmonic Nanostructures By Circularly Polarized Light". ECS Meeting Abstracts MA2022-01, nr 13 (7.07.2022): 929. http://dx.doi.org/10.1149/ma2022-0113929mtgabs.

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Chiral plasmonic nanostructures attracts attention because they are potentially applicable to optical materials such as enantioselective sensors and metamaterials, as well as photoelectrochemical devices. Chiral nanostructures are often prepared by electron beam lithography or synthesis based on DNA templates. We have recently developed a photoelectrochemical method, in which handedness of the chiral nanostructure can be controlled by right- or left- circularly polarized light. The photoelectrochemical method is based on plasmon-induced charge separation (PICS),1,2 in which electrons are injected from a plasmonic metal nanoparticle to a semiconductor such as titania in direct contact. In PICS, anodic reactions often occur at the resonance sites of the plasmonic nanoparticle, at which electron oscillation is localized.3,4 Energetic electron-hole pairs generate at the resonance site, and holes are used for the local anodic reaction, probably via trap sites. On the basis of the mechanisms, we have demonstrated site-selective etching of silver nanoparticles and site-selective deposition of lead oxide on gold nanoparticles. Under right-circularly polarized light (CPL), distribution of the resonance sites could be the mirror image of that under left-CPL.5 Therefore, we performed site-selective deposition of lead oxide on gold nanocuboids on titania under right- or left-CPL.6 As a result, lead oxide was deposited on the gold nanocuboids in a chiral geometry. The nanostructures thus obtained exhibited circular dichroism (CD), and the CD spectrum obtained for the structure prepared under right-CPL was opposite to that obtained for the structure prepared under left-CPL. Reversible switching of the handedness of the chiral plasmonic nanostructures can also be possible.7 This method also allows us to fabricate spiral nanostructures. 1. Y. Tian and T. Tatsuma, J. Am. Chem. Soc., 127, 7632 (2005). 2. T. Tatsuma, H. Nishi, and T. Ishida, Chem. Sci., 8, 3325 (2017) [review]. 3. I. Tanabe and T. Tatsuma, Nano Lett., 12, 5418 (2012). 4. T. Tatsuma and H. Nishi, Nanoscale Horiz., 5, 597 (2020) [review]. 5. S. Hashiyada, T. Narushima, and H. Okamoto, J. Phys. Chem. C, 118, 22229 (2014). 6. K. Saito and T. Tatsuma, Nano Lett., 18, 3209 (2018). 7. K. Morisawa, T. Ishida, and T. Tatsuma, ACS Nano, 14, 3603 (2020).

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Zhao, Jun, Bettina Frank, Frank Neubrech, Chunjie Zhang, Paul V. Braun i Harald Giessen. "Hole-mask colloidal nanolithography combined with tilted-angle-rotation evaporation: A versatile method for fabrication of low-cost and large-area complex plasmonic nanostructures and metamaterials". Beilstein Journal of Nanotechnology 5 (6.05.2014): 577–86. http://dx.doi.org/10.3762/bjnano.5.68.

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Many nano-optical applications require a suitable nanofabrication technology. Hole-mask colloidal nanolithography has proven to be a low-cost and large-area alternative for the fabrication of complex plasmonic nanostructures as well as metamaterials. In this paper, we describe the fabrication process step by step. We manufacture a variety of different plasmonic structures ranging from simple nano-antennas over complex chiral structures to stacked composite materials for applications such as sensing. Additionally, we give details on the control of the nanostructure lateral density which allows for the multilayer-fabrication of complex nanostructures. In two accompanying movies, the fabrication strategy is explained and details are being demonstrated in the lab. The movies can be found at the website of Beilstein TV.

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Chen, Shanshan, Chang-Yin Ji, Yu Han, Xing Liu, Yongtian Wang, Juan Liu i Jiafang Li. "Plasmonic diastereoisomer arrays with reversed circular dichroism simply controlled by deformation height". APL Photonics 7, nr 5 (1.05.2022): 056102. http://dx.doi.org/10.1063/5.0085981.

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Chirality reversal between enantiomers is of great importance in both fundamental science and practical applications in chiroptics, biomedicine, and analytical chemistry. Here, we demonstrate an abrupt sign reversal of circular dichroism (CD) between artificial plasmonic diastereoisomers, which are a kind of stereo twisted metamolecules with different strength of deformations. The sign of the CD response is reversed in the same wavelength region by simply engineering the deformation height of nanostructures. Electromagnetic multipolar analysis shows that the sign of CD is determined by the phase-controlled handedness-dependent excitations of electric quadrupole modes. The numerical simulations are further verified by experiments using a nano-kirigami fabrication method. This work reveals that under certain circumstances, the CD response of the plasmonic diastereoisomers can be very close to that of enantiomers, which is useful for the exploration of profound chiroptics, as well as for the applications in chirality switching, chiral biosensing, and chiral separation.

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10

Osanloo, Nahid, Vahid Ahmadi, Mohammad Naser-Moghaddasi i Elham Darabi. "Engineered nano-sphere array of gold-DNA core–shells and junctions as opto-plasmonic sensors for biodetection". RSC Advances 11, nr 44 (2021): 27215–25. http://dx.doi.org/10.1039/d1ra03079e.

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Roychoudhury, Piya, Rahul Bose, Przemysław Dąbek i Andrzej Witkowski. "Photonic Nano-/Microstructured Diatom Based Biosilica in Metal Modification and Removal—A Review". Materials 15, nr 19 (23.09.2022): 6597. http://dx.doi.org/10.3390/ma15196597.

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The siliceous exoskeletal shells of diatoms, commonly known as frustules, have drawn attention because of their photoluminescence property and high volume to surface area. Photonic biosilica can also enhance the plasmonic sensitivity of nanoparticles. Because of this, researchers have studied the effectiveness of various metal particles after combining with biosilica. Additionally, naturally occurring diatom-based biosilica has excellent adsorption and absorption capabilities, which have already been exploited for wastewater treatment. Moreover, the nanoporous, ultra-hydrophilic frustules can easily accumulate more molecules on their surfaces. As a consequence, it becomes easier to conjugate noble metals with silica, making them more stable and effective. The main focus of this review is to agglomerate the utility of biocompatible diatom frustules, which is a no-cost natural resource of biosilica, in metal modification and removal.

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Ghimire, Rupesh, Jhih-Sheng Wu, Vadym Apalkov i Mark I. Stockman. "Topological nanospaser". Nanophotonics 9, nr 4 (19.03.2020): 865–74. http://dx.doi.org/10.1515/nanoph-2019-0496.

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AbstractWe propose a nanospaser made of an achiral plasmonic–metal nanodisk and a two-dimensional chiral gain medium – a monolayer nanoflake of a transition-metal dichalcogenide (TMDC). When one valley of the TMDC is selectively pumped (e.g. by a circular-polarized radiation), the spaser (surface plasmon amplification by stimulated emission of radiation) generates a mode carrying a topological chiral charge that matches that of the gain valley. There is another, chirally mismatched, time-reversed mode with exactly the same frequency but the opposite topological charge; it is actively suppressed by the gain saturation and never generates, leading to a strong topological protection for the generating matched mode. This topological spaser is promising for use in nano-optics and nanospectroscopy in the near field especially in applications to biomolecules that are typically chiral. Another potential application is a chiral nanolabel for biomedical applications emitting in the far field an intense circularly polarized coherent radiation.

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13

Csernai, L. P. "Advances in Relativistic Fluid Dynamics, Observables, and Applications - In Memoriam Walter Greiner". EPJ Web of Conferences 182 (2018): 01002. http://dx.doi.org/10.1051/epjconf/201818201002.

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Walter Greiner was one of the first physicists using Relativistic Fluid Dynamics for High Energy Nuclear Reactions. The present Inertial Confinement Fusion research and development is hindered by hydrodynamic instabilities, occurring at the intense compression of the target fuel by energetic laser beams. The suggested method combines recent advances in two fields: detonations in relativistic fluid dynamics and radiative energy deposition by plasmonic nano-shells. The compression of the target can be negligible and a laser pulse achieves rapid volume ignition, which is as short as the penetration time of the light across the pellet. The reflectivity of the target can be made negligible, and the absorptivity can be increased by one or two orders of magnitude using plasmonic nanoshells embedded in the target fuel. Thus, higher ignition temperature can be achieved with modest compression. The short light pulse can heat most of the interior of the target to the ignition temperature simultaneously. This prevents the development of any kind of instability, which would prevent complete ignition or transition of the target.

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14

Frosch, Timea, Andreas Knebl i Torsten Frosch. "Recent advances in nano-photonic techniques for pharmaceutical drug monitoring with emphasis on Raman spectroscopy". Nanophotonics 9, nr 1 (9.12.2019): 19–37. http://dx.doi.org/10.1515/nanoph-2019-0401.

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AbstractInnovations in Raman spectroscopic techniques provide a potential solution to current problems in pharmaceutical drug monitoring. This review aims to summarize the recent advances in the field. The developments of novel plasmonic nanoparticles continuously push the limits of Raman spectroscopic detection. In surface-enhanced Raman spectroscopy (SERS), these particles are used for the strong local enhancement of Raman signals from pharmaceutical drugs. SERS is increasingly applied for forensic trace detection and for therapeutic drug monitoring. In combination with spatially offset Raman spectroscopy, further application fields could be addressed, e.g. in situ pharmaceutical quality testing through the packaging. Raman optical activity, which enables the thorough analysis of specific chiral properties of drugs, can also be combined with SERS for signal enhancement. Besides SERS, micro- and nano-structured optical hollow fibers enable a versatile approach for Raman signal enhancement of pharmaceuticals. Within the fiber, the volume of interaction between drug molecules and laser light is increased compared with conventional methods. Advances in fiber-enhanced Raman spectroscopy point at the high potential for continuous online drug monitoring in clinical therapeutic diagnosis. Furthermore, fiber-array based non-invasive Raman spectroscopic chemical imaging of tablets might find application in the detection of substandard and counterfeit drugs. The discussed techniques are promising and might soon find widespread application for the detection and monitoring of drugs in various fields.

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Li, Lianmeng, Xiangyu Zeng, Manna Gu, Yuqin Zhang, Rui Sun, Ziheng Zhang, Guosen Cui, Yuxiang Zhou, Chuanfu Cheng i Chunxiang Liu. "Plasmonic Metasurfaces for Superposition of Profile-Tunable Tightly Focused Vector Beams and Generation of the Structured Light". Photonics 10, nr 3 (15.03.2023): 317. http://dx.doi.org/10.3390/photonics10030317.

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Vector beams (VBs) and their superposition have found important applications in versatile fields such as optical communications, super-resolution microscopy and quantum information, and metasurfaces have enabled the miniaturization and integration of the optical systems manipulating the vector beams, providing potential applications to subwavelength regimes. In this work, we propose a metasurface to realize the superposition of profile-tunable tightly focused VBs, with the novel structured light fields generated. The metasurface is composed of two sets of orthogonal-nanoslit pairs arranged on the inner and outer rings. By realizing the chiral conversion of circularly polarized light with the slit-pairs which act as half-wave plates, and by creating helical phase profiles of optical vortices with the geometrical phase of rotational nano-slit pairs, two focused Bessel VBs are formed. By finely varying the diameters of two sets of rings, the doughnuts of the two Bessel VBs of different orders are tuned to be of the same size, and the superposition of the two VBs is realized. The theoretical analyses of the superimposed fields were presented, the FDTD simulations were performed to optimize the designed metasurfaces, and the experimental measurements were carried out to validate feasibility of the metasurface. The novel and interesting characteristics of the superposed fields different from those of the conventional VBs were demonstrated. This work will be of significance for classical and quantum applications of VBs in various fields.

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Yang, Xiu, Shanshan Huang, Rohit Chikkaraddy, Eric S. A. Goerlitzer, Feiliang Chen, Jinglei Du, Nicolas Vogel, Thomas Weiss, Jeremy J. Baumberg i Yidong Hou. "Chiral Plasmonic Shells: High-Performance Metamaterials for Sensitive Chiral Biomolecule Detection". ACS Applied Materials & Interfaces, 15.11.2022. http://dx.doi.org/10.1021/acsami.2c16752.

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Sunaba, Yuji, Masaki Ide, Ryo Takei, Kyosuke Sakai, Christophe Pin i Keiji Sasaki. "Nano-shaping of chiral photons". Nanophotonics, 16.05.2023. http://dx.doi.org/10.1515/nanoph-2022-0779.

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Abstract Localized surface plasmon polaritons can confine the optical field to a single-nanometer-scale area, strongly enhancing the interaction between photons and molecules. Theoretically, the ultimate enhancement might be achieved by reducing the “photon size” to the molecular extinction cross-section. In addition, desired control of electronic transitions in molecules can be realized if the “photon shape” can be manipulated on a single-nanometer scale. By matching the photon shape with that of the molecular electron wavefunction, optically forbidden transitions can be induced efficiently and selectively, enabling various unconventional photoreactions. Here, we demonstrate the possibility of forming single-nanometer-scale, highly intense fields of optical vortices using designed plasmonic nanostructures. The orbital and spin angular momenta provided by a Laguerre–Gaussian beam are selectively transferred to the localized plasmons of a metal multimer structure and then confined into a nanogap. This plasmonic nano-vortex field is expected to fit the molecular electron orbital shape and spin with the corresponding angular momenta.

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Wang, Fei, Zexiang Han, Juehan Sun, XueKang Yang, Xiaoli Wang i Zhiyong Tang. "Reversible Ultrafast Chiroptical Responses in Planar Plasmonic Nano‐Oligomer". Advanced Materials, wrzesień 2023. http://dx.doi.org/10.1002/adma.202304657.

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Abstract(Ultracompact chiral plasmonic nanostructures with unique chiral light‐matter interactions are vital for future photonic technologies. However, previous studies are limited to reporting their steady‐state performance, presenting a fundamental obstacle to the development of high‐speed optical devices with polarization sensitivity. Here, we provide a comprehensive analysis of ultrafast chiroptical response of chiral gold nano‐oligomers using time‐resolved polarimetric measurements. We observe significant differences in terms of the absorption intensity, thus hot electron generation, and hot carrier decay time upon polarized photo‐pumping, which are explained by a phenomenological model of the helicity‐resolved optical transitions. Moreover, the chiroptical signal is switchable by reversing the direction of the pump pulse, demonstrating the versatile modulation of polarization selection in a single device. Our results offer fundamental insights into the helicity‐resolved optical transitions in photoexcited chiral plasmonics and could facilitate the development of high‐speed polarization‐sensitive flat optics with potential applications in nanophotonics and quantum optics.)This article is protected by copyright. All rights reserved

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Zhang, Yingjie, Junqing Li, Rui Zhao i Xingguang Liu. "Characteristics of surface plasmonic modes in cylindrical chiral-graphene-dielectric waveguide structure". Journal of Physics D: Applied Physics, 29.11.2022. http://dx.doi.org/10.1088/1361-6463/aca6f4.

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Abstract A cylindrical chiral-graphene-dielectric waveguide structure is proposed. Correspondingly, characteristics of surface plasmonic mode are theoretically investigated, including dispersion relation, intensity, phase and polarization distribution. The proposed waveguide can only support the vortex modes with the hybrid polarization distribution, which originates from the spin-momentum locking of evanescent electromagnetic waves. The circular birefringence of chiral materials releases the degeneracy between same-order vortex modes. In addition, the number of modes can be controlled by changing the radius of the dielectric nanowire and the Fermi level of graphene. The effective index and corresponding propagation length of the mode are sensitive to the chiral parameter. We believe the proposed waveguide can find some potential applications in multiplex communication, chiral sensing and the fabrication of tunable nano-photonic devices.

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Cognée, Kévin G., Hugo M. Doeleman, Philippe Lalanne i A. F. Koenderink. "Cooperative interactions between nano-antennas in a high-Q cavity for unidirectional light sources". Light: Science & Applications 8, nr 1 (grudzień 2019). http://dx.doi.org/10.1038/s41377-019-0227-x.

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AbstractWe analyse the resonant mode structure and local density of states in high-Q hybrid plasmonic-photonic resonators composed of dielectric microdisks hybridized with pairs of plasmon antennas that are systematically swept in position through the cavity mode. On the one hand, this system is a classical realization of the cooperative resonant dipole–dipole interaction through a cavity mode, as is evident through predicted and measured resonance linewidths and shifts. At the same time, our work introduces the notion of ‘phased array’ antenna physics into plasmonic-photonic resonators. We predict that one may construct large local density of states (LDOS) enhancements exceeding those given by a single antenna, which are ‘chiral’ in the sense of correlating with the unidirectional injection of fluorescence into the cavity. We report an experiment probing the resonances of silicon nitride microdisks decorated with aluminium antenna dimers. Measurements directly confirm the predicted cooperative effects of the coupled dipole antennas as a function of the antenna spacing on the hybrid mode quality factors and resonance conditions.

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Singh, Sneha. "Determination of fundamental coupled torsional—radial frequency of single-walled carbon nanotubes". Journal of Vibration and Control, 20.12.2020, 107754632098134. http://dx.doi.org/10.1177/1077546320981349.

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Research indicates that single-walled carbon nanotubes have a unique coupled torsional–radial vibration as one of their fundamental modes. Determination of their vibration frequency is required for efficient use of single-walled carbon nanotube in nano-electromechanical systems. However, there is no mathematical expression for these frequencies and their dependence on single-walled carbon nanotube geometry is unknown. This article examines the effect of diameter, length, and chirality on the fundamental coupled torsional–radial vibration frequency of single-walled carbon nanotube using molecular–structural–mechanics–approach, finite element analysis, and regression analyses. Consequently, a first-ever mathematical form of this frequency is derived. The form quickly and accurately predicts these frequencies at 1.5% in-sample, and 7.2% out-sample mean absolute percentage error. single-walled carbon nanotubes’ fundamental coupled torsional–radial vibration frequency is found independent of diameter and inversely proportional to length where the proportionality constant depends on chirality. The coupling of modes and the similarity of the frequency form with cylindrical shell suggest that single-walled carbon nanotube behave like thin shells in these vibrations. A form for effective circumferential shear modulus of single-walled carbon nanotube is also derived. This modulus is found to depend only on the chirality where achiral single-walled carbon nanotubes have higher values than chiral single-walled carbon nanotubes. Proposed mathematical forms can be used for characterization of single-walled carbon nanotubes, determination of single-walled carbon nanotubes’ effective shear modulus, and tuning operational frequency of single-walled carbon nanotube-based nano-electromechanical systems.

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Artykuły w czasopismach na temat „Chiral Plasmonic Nano Shells”

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