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Статті в журналах з теми "Plasmon-based strong optical properties"
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Vodnik, Vesna V., Dušan K. Božanić, Nataša Bibić, Zoran V. Šaponjić, and Jovan M. Nedeljković. "Optical Properties of Shaped Silver Nanoparticles." Journal of Nanoscience and Nanotechnology 8, no. 7 (July 1, 2008): 3511–15. http://dx.doi.org/10.1166/jnn.2008.144.
Повний текст джерелаАнотація:
The influence of shape and dielectric property of surrounding media on surface plasmon absorption band of silver nanoparticles was studied. Spherical silver nanoparticles (d = 5.6 nm) synthesized in water using NaBH4 as a reducing agent are transferred in non-polar solvent (chloroform) with phase-transfer reagent oleylamine. The absorption spectrum of oleylamine-capped silver nanoparticles dispersed in chloroform shows a strong surface plasmon resonance band that is 19 nm red-shifted compared to unmodified particles in water. The values for peak position and corresponding half widths are compared with theoretical calculations based on Mie theory. Prismatic and plate-like silver nanoparticles were synthesized in water using trisodium citrate as a reducing agent and cetyltrimethylammonium bromide as stabilizer. Due to structural anisotropy of prismatic and plate-like silver nanoparticles three surface plasmon resonance bands were observed in absorption spectrum. Nanocomposites consisting of non-spherical silver nanoparticles and polyvinyl alcohol exhibit different optical properties compared to water colloid. Instead of three surface plasmon bands, nanocomposite film has only one peak at 460 nm. Reason for appearance of single surface plasmon resonance band in nanocomposite film was discussed according to Maxwell-Garnet theory.
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Yuan, Zong Heng, Dong Dong Zhu, and Peng Wang. "The Study of Nano Optical Antenna Based on Surface Plasmon Resonance." Applied Mechanics and Materials 110-116 (October 2011): 3825–30. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.3825.
Повний текст джерелаАнотація:
The strong local property of surface plasmon polaritons can break through the diffraction limit, and reduce the propagation of corner scattering on nanoscale. The nanoantenna structure based on the plasmon resonant effect can collect the light energy effectively, and the local field enhancement effects of the structure have extensive application prospect. The field distribution and field enhancement effects of optical antenna under nanoscale are calculated with finite-difference time-domain (FDTD) method. Several different structures of nanooptical antenna are studied, and their enhancement properties are compared in this paper.
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LEE, YIH HONG, POLAVARAPU LAKSHMINARAYANA, CUIFENG JIANG, PEIYAN YUAN, and QING-HUA XU. "RECENT ADVANCES IN METAL-ENHANCED OPTICAL PROPERTIES." COSMOS 06, no. 02 (December 2010): 167–95. http://dx.doi.org/10.1142/s0219607710000619.
Повний текст джерелаАнотація:
Noble metal nanoparticles exhibit strong surface plasmon resonance (SPR) and have been utilized in many chemical, biological and electronic applications. Recent advances on metal-enhanced optical properties demonstrated that the quantum yield and photo-stability of the fluorophores can be significantly enhanced when they are in the proximity of the metal surface, that will benefit many fluorescence-based applications. In this review article we first discuss the fundamental concepts of metal-enhanced optical properties and the recent achievements of metal-enhanced fluorescence of organic fluorophores and quantum dots, as well as metal-enhanced phosphorescence of organic molecules and upconversion nanoparticles that have long life times. Finally, we present recent applications of metal-enhanced optical properties in biosensing and bioassays, photodynamic therapy and optoelectronics.
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Benoit, J. M., K. Chevrier, C. Symonds, and J. Bellessa. "Strong coupling for bifunctionality in organic systems." Applied Physics Letters 121, no. 18 (October 31, 2022): 181101. http://dx.doi.org/10.1063/5.0116184.
Повний текст джерелаАнотація:
In this paper, we exploit the strong light–matter coupling to hybridize two materials for bifunctionality properties. The strong coupling has been achieved between a surface plasmon and two organic emitters: a J-aggregate cyanine dye, known for its high absorption and emission properties and a photochromic material in which absorption can be optically switched on and off. The optical properties are drastically modified between the activated and deactivated forms of the photochromic material coupled to the cyanine dye. In particular, the emission of the structure can be energy shifted by several hundreds of meV providing a way to build a tunable emission system. This system also reveals its potential for modifying the fluorescence of photochromes thanks to light–matter interaction instead of functionalization using covalent bonding.
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Tang, Yuankai, Xiantong Yu, Haifeng Pan, Jinquan Chen, Benjamin Audit, Françoise Argoul, Sanjun Zhang, and Jianhua Xu. "Numerical Study of Novel Ratiometric Sensors Based on Plasmon–Exciton Coupling." Applied Spectroscopy 71, no. 10 (May 16, 2017): 2377–84. http://dx.doi.org/10.1177/0003702817706979.
Повний текст джерелаАнотація:
We numerically studied the optical properties of spherical nanostructures made of an emitter core coated by a silver shell through the generalized Mie theory. When there is a strong coupling between the localized surface plasmon in the metallic shell and the emitter exciton in the core, the extinction spectra exhibit two peaks. Upon adsorption of analytes on these core-shell nanostructures, the intensities of the two peaks change with opposite trends. This property makes them potential sensitive ratiometric sensors. Molecule adsorption on these nanostructures can be quantified through a very simple optical configuration likely resulting in a much faster acquisition time compared with systems based on the traditional metal nanoparticle surface plasmon resonance (SPR) biosensors.
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Kim, Wan-Joong, JaeTae Seo, Chil Seong Ah, Jasmine Austin, Shanghee Kim, Ansoon Kim, Gun Yong Sung, and Wan Soo Yun. "Colorimetric Analysis on Flocculation of Bioinspired Au Self-Assembly for Biophotonic Application." Journal of Nanomaterials 2009 (2009): 1–6. http://dx.doi.org/10.1155/2009/261261.
Повний текст джерелаАнотація:
Gold nanoparticles exhibited strong surface plasmon absorption and couplings between neighboring particles within bioactivated self-assembly modified their optical properties. Colorimetric analysis on the optical modification of surface plasmon resoanance (SPR) shift and flocculation parameter functionalized bioinspired gold assembly for biophotonic application. The physical origin of bioinspired gold aggregation-induced shifting, decreasing, or broadening of the plasmon absorption spectra could be explained in terms of dynamic depolarization, collisional damping, and shadowing effects.
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Bitton, Ora, Satyendra Nath Gupta, and Gilad Haran. "Quantum dot plasmonics: from weak to strong coupling." Nanophotonics 8, no. 4 (February 23, 2019): 559–75. http://dx.doi.org/10.1515/nanoph-2018-0218.
Повний текст джерелаАнотація:
AbstractThe complementary optical properties of surface plasmon excitations of metal nanostructures and long-lived excitations of semiconductor quantum dots (QDs) make them excellent candidates for studies of optical coupling at the nanoscale level. Plasmonic devices confine light to nanometer-sized regions of space, which turns them into effective cavities for quantum emitters. QDs possess large oscillator strengths and high photostability, making them useful for studies down to the single-particle level. Depending on structure and energy scales, QD excitons and surface plasmons (SPs) can couple either weakly or strongly, resulting in different unique optical properties. While in the weak coupling regime plasmonic cavities (PCs) mostly enhance the radiative rate of an emitter, in the strong coupling regime the energy level of the two systems mix together, forming coupled matter-light states. The interaction of QD excitons with PCs has been widely investigated experimentally as well as theoretically, with an eye on potential applications ranging from sensing to quantum information technology. In this review we provide a comprehensive introduction to this exciting field of current research, and an overview of studies of QD-plasmon systems in the weak and strong coupling regimes.
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Yi, Zao, Xin Li, Xibin Xu, Xifang Chen, Xin Ye, Yong Yi, Tao Duan, Yongjian Tang, Jiangwei Liu, and Yougen Yi. "Nanostrip-Induced High Tunability Multipolar Fano Resonances in a Au Ring-Strip Nanosystem." Nanomaterials 8, no. 8 (July 25, 2018): 568. http://dx.doi.org/10.3390/nano8080568.
Повний текст джерелаАнотація:
Surface plasmon resonances of a Au ring-strip nanosystem with tunable multipolar Fano resonances have been investigated based on the finite-difference time-domain (FDTD) method. Abundant plasmon properties of a Au ring-strip nanosystem can be obtained on the basis of the unique electronic properties of different geometry parameters. In our research models, these multipolar Fano resonances are induced and can be tuned independently by changing the geometry parameters of the Au ring-strip nanosystem. Complex electric field distributions excited by the Au ring-strip nanosystem provide possibility to form dark plasmonic modes. Multipolar Fano resonances display strong light extinction in the Au ring-strip nanosystem, which can offer a new approach for an optical tunable filter, optical switching, and advanced biosensing.
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Halas, Naomi. "Playing with Plasmons: Tuning the Optical Resonant Properties of Metallic Nanoshells." MRS Bulletin 30, no. 5 (May 2005): 362–67. http://dx.doi.org/10.1557/mrs2005.99.
Повний текст джерелаАнотація:
AbstractNanoshells, concentric nanoparticles consisting of a dielectric core and a metallic shell, are simple spherical nanostructures with unique, geometrically tunable optical resonances. As with all metallic nanostructures, their optical properties are controlled by the collective electronic resonance, or plasmon resonance, of the constituent metal, typically silver or gold. In striking contrast to the resonant properties of solid metallic nanostructures, which exhibit only a weak tunability with size or aspect ratio, the optical resonance of a nanoshell is extraordinarily sensitive to the inner and outer dimensions of the metallic shell layer. The underlying reason for this lies beyond classical electromagnetic theory, where plasmon-resonant nanoparticles follow a mesoscale analogue of molecular orbital theory, hybridizing in precisely the same manner as the individual atomic wave functions in simple molecules. This plasmon hybridization picture provides an essential “design rule” for metallic nanostructures that can allow us to effectively predict their optical resonant properties. Such a systematic control of the far-field optical resonances of metallic nanostructures is accomplished simultaneously with control of the field at the surface of the nanostructure. The nanoshell geometry is ideal for tuning and optimizing the near-field response as a stand-alone surface-enhanced Raman spectroscopy (SERS) nanosensor substrate and as a surface-plasmon-resonant nanosensor.Tuning the plasmon resonance of nanoshells into the near-infrared region of the spectrum has enabled a variety of biomedical applications that exploit the strong optical contrast available with nanoshells in a spectral region where blood and tissue are optimally transparent.
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Nan, Ya Li, Shang Xu, Fei Liu, and Jian Feng Zhou. "Gas Phase Synthesis of Vanadium Oxide Nanoparticle Films with Temperature Controlled Surface Plasmon Resonance Properties." Applied Mechanics and Materials 548-549 (April 2014): 152–57. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.152.
Повний текст джерелаАнотація:
Vanadium oxide nanoparticles were synthesized with controlled size and dispersity by gas phase cluster beam deposition. The composition of the nanoparticle film is dominated with VO2 nanoparticles. The VO2 nanoparticles undergo a phase transition between the room temperature monoclinic insulator phase and the higher temperature rutile metal phase. In the metallic phase, the VO2 nanoparticles exhibit a strong surface plasmon resonance in the near-IR region from 900nm to the 2000nm, which generates a large enhancement on the extinction coefficient. This plasmon resonance is thermally controlled by the VO2 MIT and can be used to improve the optical switching characteristics of VO2 based devices in the near-IR region.
Дисертації з теми "Plasmon-based strong optical properties"
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Chhantyal, Parva [Verfasser]. "Optical properties of surface plasmon polaritons and semiconductor based quantum system / Parva Chhantyal." Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/1169965733/34.
Повний текст джерела
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Wang, Haining. "Novel optical properties of metal nanostructures based on surface plasmons." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5720.
Повний текст джерелаАнотація:
Surface plasmons have been attracted extensive interests in recent decades due to the novel properties in nanometer sized dimensions. My work focused on the novel optical properties of metal nanostructures based on surface plasmons using theoretical simulation methods. In the first part, we investigated metal nanofilms and nanorods and demonstrated that extremely low scattering efficiency, high absorption efficiency and propagation with long distance could be obtained by different metal nanostructures. With a perforated silver film, we demonstrated that an extremely low scattering cross section with an efficiency of less than 1% can be achieved at tunable wavelengths with tunable widths. The resonance wavelength, width, and intensity are influenced by the shape, size and arrangement pattern of the holes, as well as the distance separating the holes along the polarization direction. The extremely low scattering could be used to obtain high absorption efficiency of a two-layer silver nanofilm. Using the discrete dipole approximation method, we achieved enhanced absorption efficiencies, which are close to 100%, at tunable wavelengths in a two-layer silver thin film. The film is composed of a 100 nm thick perforated layer facing the incident light and a 100 nm thick solid layer. Resonance wavelengths are determined by the distances between perforated holes in the first layer as well as the separation between two layers. The resonance wavelengths shift to red with increasing separation distance between two layers or the periodic distance of the hole arrays. Geometries of conical frustum shaped holes in the first layer are critical for the improved absorption efficiencies. When the hole bottom diameter equals the periodic distance and the upper diameter is about one-third of the bottom diameter, close to unit absorption efficiency can be obtained. We examined the electromagnetic wave propagation along a hollow silver nanorod with subwavelength dimensions. The calculations show that light may propagate along the hollow nanorod with growing intensities. The influences of the shape, dimension, and length of the rod on the resonance wavelength and the enhanced local electric field, |E|2, along the rod were investigated. In the second part, a generalized electrodynamics model is proposed to describe the enhancement and quenching of fluorescence signal of a dye molecule placed near a metal nanoparticle (NP). Both the size of the Au NPs and quantum yield of the dye molecule are crucial in determining the emission intensity of the molecule. Changing the size of the metal NP will alter the ratio of the scattering and absorption efficiencies of the metal NP and consequently result in different enhancement or quenching effect to the dye molecule. A dye molecule with a reduced quantum yield indicates that the non-radiative channel is dominant in the decay of the excited dye molecules and the amplification of the radiative decay rate will be easier. In general, the emission intensity will be quenched when the size of metal NP is small and the quantum yield of dye molecule is about unity. A significant enhancement factor will be obtained when the quantum yield of the molecule is small and the particle size is large. When the quantum yield of the dye molecule is less than 10-5, the model is simplified to the surface enhanced Raman scattering equation.Ph.D.
Doctorate
Chemistry
Sciences
Chemistry
Частини книг з теми "Plasmon-based strong optical properties"
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Kumar Raghuwanshi, Sanjeev, Santosh Kumar, and Yadvendra Singh. "Fundamental Optical Properties of 2D Materials." In 2D Materials for Surface Plasmon Resonance-based Sensors, 41–85. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003190738-2.
Повний текст джерела
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Buchberger, Gerda, Martina Muck, Cristina Plamadeala, and Johannes Heitz. "Laser Structuring for Biomedical Applications." In Springer Series in Optical Sciences, 1105–65. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-14752-4_31.
Повний текст джерелаАнотація:
AbstractLaser structuring enables modification of sample topography, surface chemistry, and/or physical properties of materials. Examples of these processes are ripple, nap or wall formation, surface oxidation, induction of polymerization reactions, or changes in crystallinity or contact angle. These – most of the time – interrelated modifications are exploited widely for biomedical applications. They range from cell-repellent surfaces for easy-to-replace cardiac pacemakers, control of cell proliferation required in regenerative medicine, to increased cell adhesion for cell arrays. Furthermore, ns-laser-induced nanoripples were used for formation of gold nanowires for future surface plasmon resonance sensors directly integrated into biotechnological devices. Additive nano- and microscale manufacturing by two-photon polymerization allows for considerable progress in cell scaffold formation, paving the path for in vitro–grown organs, bones, and cartilages. The very same fs-laser-based technique was also used for biomimetic microneedles with enhanced liquid spreading on their surface. Microneedles are promising candidates for low-cost, high-throughput drug delivery and vaccination applicable even by nonmedically trained personnel. Microfluidic systems fabricated by fs-lasers have enabled progress in 3D microscopy of single cells and in studies on thrombocyte activation with the help of nanoanchors. Explicating the abovementioned and further biomedical applications, the authors put special focus on the achieved limits pointing out what scientists have accomplished so far in their pursuit of extreme scales.
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Shahzadi, Phool. "Properties of Nanomaterials and Environment." In Research Anthology on Synthesis, Characterization, and Applications of Nanomaterials, 89–104. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8591-7.ch004.
Повний текст джерелаАнотація:
The chapter provides a timely review of the various properties of nonmaterial and their applications into environmental compartments. An extensive variety of poisonous chemicals is discharged into the environment because of globalization and industrialization. The dimensional, compositional, geometric, and structural properties are fundamental to convey usefulness of the nanomaterials. The controlled sizes and shapes of nanoparticles are anticipated to yield unique catalytic, electrochemical, and photochemical properties. The electrochemical properties of monolayer-functional metal nanoparticles are expected to be controlled by the particle sizes. Metal nanomaterials have interesting optical properties due to strong surface plasmon absorption and field enhancement effects; metal oxides lack visible absorption due to very large bandgap. Nanocomposites have complex optical properties. Nanomaterials present gigantic advantages on diverse applications, catalysis, imaging, biotechnological, and sensor applications due to their improved properties.
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Shahzadi, Phool. "Properties of Nanomaterials and Environment." In Nanotechnology Applications in Environmental Engineering, 28–43. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5745-6.ch002.
Повний текст джерелаАнотація:
The chapter provides a timely review of the various properties of nonmaterial and their applications into environmental compartments. An extensive variety of poisonous chemicals is discharged into the environment because of globalization and industrialization. The dimensional, compositional, geometric, and structural properties are fundamental to convey usefulness of the nanomaterials. The controlled sizes and shapes of nanoparticles are anticipated to yield unique catalytic, electrochemical, and photochemical properties. The electrochemical properties of monolayer-functional metal nanoparticles are expected to be controlled by the particle sizes. Metal nanomaterials have interesting optical properties due to strong surface plasmon absorption and field enhancement effects; metal oxides lack visible absorption due to very large bandgap. Nanocomposites have complex optical properties. Nanomaterials present gigantic advantages on diverse applications, catalysis, imaging, biotechnological, and sensor applications due to their improved properties.
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Hasan Hamood Al-Masoodi, Abtisam, Boon Tong Goh, Ahmed H.H. Al-Masoodi, and Wan Haliza Binti Abd Majid. "Deposition of Silver Nanoparticles on Indium Tin Oxide Substrates by Plasma-Assisted Hot-Filament Evaporation." In Thin Films [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94456.
Повний текст джерелаАнотація:
Nanoparticles of noble metals have unique properties including large surface energies, surface plasmon excitation, quantum confinement effect, and high electron accumulation. Among these nanoparticles, silver (Ag) nanoparticles have strong responses in visible light region due to its high plasmon excitation. These unique properties depend on the size, shape, interparticle separation and surrounded medium of Ag nanoparticles. Indium tin oxide (ITO) is widely used as an electrode for flat panel devices in such as electronic, optoelectronic and sensing applications. Nowadays, Ag nanoparticles were deposited on ITO to improve their optical and electrical properties. Plasma-assisted hot-filament evaporation (PAHFE) technique produced high-density of crystalline Ag nanoparticles with controlling in the size and distribution on ITO surface. In this chapter, we will discuss about the PAHFE technique for the deposition of Ag nanoparticles on ITO and influences of the experimental parameters on the physical and optical properties, and electronic structure of the deposited Ag nanoparticles on ITO.
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Basak, Tista, and Tushima Basak. "Recent Advances in Graphene Based Plasmonics." In Photonic Materials: Recent Advances and Emerging Applications, 56–84. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815049756123010007.
Повний текст джерелаАнотація:
Plasmonics is an emerging and fast-growing branch of science and technology that focuses on the coupling of light to the free electron density in metals, resulting in strong electromagnetic field enhancement due to confinement of light into sub-wavelength dimensions beyond the diffraction limit. The development of novel photonic and optoelectronic devices based on metal-based plasmonics is however plagued by the high loss at optical frequencies, originating partly from inter-band electronic transitions and lack of electrical tunability, practically limiting their potential applications in the terahertz (THz) and mid-IR spectrum range. The recent successful exfoliation of graphene from graphite has rendered a breakthrough in the realm of plasmonics due to its phenomenal properties such as exceptionally tight light confinement, extremely long plasmon lifetime, high carrier mobility leading to a relatively low level of losses, strong optical nonlinearity and electrostatically as well as chemically tunable response. These versatile features of graphene can effectively address the challenges faced by metals, and hence the physics and potential applications of graphene-based plasmonics have triggered increasing attention of industry, academic and research fraternity in recent years. This chapter provides a comprehensive description of the theoretical approaches adopted to investigate the dispersion relation of graphene surface plasmons, types of graphene surface plasmons and their interactions with photons, phonons and electrons, experimental techniques to detect surface plasmons, the behaviour of surface plasmons in graphene nanostructures and the recent applications of graphene-based plasmonics.
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Gambhir, Kaweri, and Agnikumar G. Vedeshwar. "Types of Nonlinear Interactions between Plasmonic-Excitonic Hybrids." In Plasmonics [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105833.
Повний текст джерелаАнотація:
The unique ability of plasmonic structures to concentrate and manipulate photonic signals in deep sub-wavelength domain provides new efficient pathways to generate, guide, modulate and detect light. Due to collective oscillations exhibited by the conducting electrons of metallic nanoparticles, their local fields can be greatly enhanced at the localized surface plasmon resonance (LSPR). Hence, they offer a versatile platform, where localized surface plasmons can be tuned over a broad range of wavelengths by controlling their shape, size and material properties. It has been realized that plasmonic excitations can strengthen nonlinear optical effects in three ways. First, the coupling between the incident beam of light and surface plasmons results in a strong local confinement of the electromagnetic fields, which in turn enhances the optical response. Second, the sensitivity of plasmonic excitations toward the dielectric properties of the metal and the surrounding medium forms the basis for label-free plasmonic sensors. Finally, the excitation and relaxation dynamics of plasmonic nanostructures responds to a timescale of femtoseconds regime, thus allowing ultrafast processing of the incident optical signals. This chapter aims to discuss all the aforementioned interactions of plasmons and their excitonic hybrids in detail and also represent a glimpse of their experimental realizations.
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Kamaja, Chaitanya Krishna, M. Rajaperumal, Rabah Boukherroub, and Manjusha V. Shelke. "Silicon Nanostructures-Graphene Nanocomposites." In Handbook of Research on Nanoscience, Nanotechnology, and Advanced Materials, 176–95. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-5824-0.ch009.
Повний текст джерелаАнотація:
Global demand of energy is increasing at an alarming rate, and nanotechnology is being looked at as a potential solution to meet this challenge (Holtren, 2007). Although the efficiency of energy conversion and storage devices depends on a variety of factors, the overall performance strongly relies on the structure and properties of the component materials (Whitesides, 2007). Compared to conventional materials, silicon (Si) nanostructures and graphene nanosheets possess unique properties (i.e. morphological, electrical, optical, and mechanical) useful for enhancing the energy-conversion and storage performances. Graphene can enhance efficiency of nano-Si based solar cells and battery due to its high electronic conductivity, ultrahigh mobility, high transparency, and strong mechanical property. This chapter provides a comprehensive review of recent progress and material challenges in energy conversion (solar cells) and storage (batteries/supercapacitors) with specific focus on composites of Si nanostructures-graphene nanosheets.
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Crisci, Teresa, Luigi Moretti, Mariano Gioffrè, and Maurizio Casalino. "Near-Infrared Schottky Silicon Photodetectors Based on Two Dimensional Materials." In Light-Emitting Diodes and Photodetectors - Advances and Future Directions [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99625.
Повний текст джерелаАнотація:
Since its discovery in 2004, graphene has attracted the interest of the scientific community due to its excellent properties of high carrier mobility, flexibility, strong light-matter interaction and broadband absorption. Despite of its weak light optical absorption and zero band gap, graphene has demonstrated impressive results as active material for optoelectronic devices. This success pushed towards the investigation of new two-dimensional (2D) materials to be employed in a next generation of optoelectronic devices with particular reference to the photodetectors. Indeed, most of 2D materials can be transferred on many substrates, including silicon, opening the path to the development of Schottky junctions to be used for the infrared detection. Although Schottky near-infrared silicon photodetectors based on metals are not a new concept in literature the employment of two-dimensional materials instead of metals is relatively new and it is leading to silicon-based photodetectors with unprecedented performance in the infrared regime. This chapter aims, first to elucidate the physical effect and the working principles of these devices, then to describe the main structures reported in literature, finally to discuss the most significant results obtained in recent years.
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"Bio-Mediated Synthesis of Quantum Dots for Fluorescent Biosensing and Bio-Imaging Applications." In Materials Research Foundations, 185–223. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901571-7.
Повний текст джерелаАнотація:
Quantum dots (QDs) have received great attention for development of novel fluorescent nanoprobe with tunable colors towards the near-infrared (NIR) region because of their unique optical and electronic properties such as luminescence characteristics, wide range, continuous absorption spectra and narrow emission spectra with high light stability. Quantum dots are promising materials for biosensing and single molecular bio-imaging application due to their excellent photophysical properties such as strong brightness and resistance to photobleaching. However, the use of quantum dots in biomedical applications is limited due to their toxicity. Recently, the development of novel and safe alternative method, the biomediated greener approach is one of the best aspects for synthesis of quantum dots. In this Chapter, biomediated synthesis of quantum dots by living organisms and biomimetic systems were highlighted. Quantum dots based fluorescent probes utilizing resonance energy transfer (RET), especially Förster resonance energy transfer (FRET), bioluminescence resonance energy transfer (BRET) and chemiluminescence resonance energy transfer (CRET) to probe biological phenomena were discussed. In addition, quantum dot nanocomposites are promising ultrasensitive bioimaging probe for in vivo multicolor, multimodal, multiplex and NIR deep tissue imaging. Finally, this chapter provides a conclusion with future perspectives of this field.
Тези доповідей конференцій з теми "Plasmon-based strong optical properties"
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Suits, F., and U. J. Gibson. "Optical Response of a Composite Medium Consisting of Metal Particles in a Nonlinear Dielectric Host." In Nonlinear Optical Properties of Materials. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/nlopm.1988.tue5.
Повний текст джерелаАнотація:
A composite medium consisting of small metallic particles in a dielectric host exhibits strong absorption at the surface plasmon resonance. This resonance causes the deep red color of gold colloids that has motivated several models of the optical properties of composite media. The Maxwell-Garnett1 theory is one of the earliest and simplest of these models, and it remains an excellent approximation to the dielectric function of composite media for small particles and small fill-fractions.
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Stegeman, George I., and Roger H. Stolen. "Waveguides and Fibers for Nonlinear Optics." In Nonlinear Optical Properties of Materials. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/nlopm.1988.tha1.
Повний текст джерелаАнотація:
Optical waveguides are ideal for nonlinear interactions because they provide strong beam confinement over long propagation distances. They are characterized by regions of high refractive index bounded by regions of lower refractive index. Examples of such waveguides are shown in Figure 1. Two-dimensional confinement is provided by optical fibers in cylindrical geometries and by channel waveguides in quasi-rectangular waveguides. Although planar waveguides provide guiding in one dimension, the beam can focus, defocus, and diffract in the plane of the film. The propagation distances in fibers are usually limited by material attenuation, with kilometers being typical for silica-based fibers. Although material losses can also limit propagation distance for integrated-optics waveguides, fabrication techniques invariably limit propagation distances to at most 10 cm, and more typically a few centimeters. The guided-wave fields extend into all of the waveguiding media. For example, for a planar waveguide, the fields are maximum inside the high-index region (film) and decay exponentially from the boundary into the low-index media. Hence nonlinear interactions can occur in any of the media defining the waveguide. However, the high-index region carries most of the guided-wave power and hence, with the exception of a few cases that require strong nonlinearities in the bounding media, nonlinear interactions are optimized when the nonlinearity occurs inside the high-index medium.
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Xuan, Yimin, Yuchun Gou, and Yuge Han. "Numerical Study on Spectral Properties of MIM (AG/MGF2/AG) Structure With Periodic Rectangular Holes." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22050.
Повний текст джерелаАнотація:
Spectral properties of metal/insulator/metal (MIM) structure with two-dimensional-hole arrays (2DHAs) are investigated by using the finite-difference time-domain (FDTD) method. The effects of the period, the hole ratio, the thickness of front layer and core layer, and the incident angle as well as the polarization angle on the spectral properties of structured surfaces are studied. It is found that extraordinary optical transmission (EOT) can be excited by the combined effect of waveguide cutoff function and surface plasmon polaritons (SPPs). For some special structure parameters, the MIM structure shows strong absorption of incident wave due to odd mode of SPPs and Fabry–Pe´rot resonance at the sub-wavelength region and relatively longer wavelength region, respectively. These results provide guide information for the application of MIM structure to the EOT devices, absorbers or radiators.
4
Smirl, Arthur L., J. Dubard, George C. Valley, and Thomas F. Boggess. "Picosecond Photorefractive and Free-Carrier Nonlinearities in Semiconductors." In Nonlinear Optical Properties of Materials. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/nlopm.1988.mc3.
Повний текст джерелаАнотація:
A variety of picosecond time-resolved two-beam coupling, transient grating and degenerate-four-wave mixing techniques are used to investigate the nonlinear loss and to measure the strength, formation and decay of photorefractive gratings written in GaAs and InP:Fe and of free-carrier gratings written in Si, GaAs, and InP by 43-ps pulses at a wavelength of 1 μm. We present data and numerical calculations as a function of fluence, time delay, pump-to-probe ratio, pump polarization, analyzer angle and crystal orientation. We observe photorefractive gains of a few percent at fluences of a few pJ/μm2 (0.1 mJ/cm2) in GaAs and InP, and we identify two sources for the photorefractive space-charge field. It is principally between mobile free carriers and stationary single-photon ionized donors at low fluences and between mobile electrons and holes produced by two-photon absorption at high fluences. We also observe strong transient energy transfer from the nominally "unshifted" free-carrier index gratings written in GaAs and InP by two-photon absorption and in Si by single-photon indirect absorption. We have demonstrated optical switches based on the pump-induced photorefractive rotation of the probe polarization in GaAs with on/off ratios of >2/1 at fluences as low as 400 fJ/μm2 and optical switches based on free-carrier transient-energy-transfer with on/off ratios >20,000/1 at 200 pJ/μm2. We have also used transient-energy-transfer to construct weak beam amplifiers with gains >25 at 30 mJ/cm2. Finally, these techniques have been used to obtain information about the properties of the deep-level (mid-gap) states in GaAs (EL2/EL2+) and InP (Fe2+/Fe3+), such as the cross sections and number densities.
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Yu, Min-Wen, Satoshi Ishii, Shisheng Li, Ji-Ren Ku, Jhen-Hong Yang, Kuan-Lin Su, Takaaki Taniguchi, Tadaaki Nagao, and Kuo-Ping Chen. "Observation of carrier transports at exciton-plasmon coupling in MoS2 monolayers and 1D plamsmonic nanogrooves." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2021. http://dx.doi.org/10.1364/jsap.2021.10a_n404_6.
Повний текст джерелаАнотація:
Two-dimensional transition metal dichalcogenides (TMDCs) have studied intensively owing to their unique optical and electronic properties [1]. Among TMDCs, monolayer molybdenum disulfide (MoS2) is a direct bandgap semiconductor with strong binding energies which make it as a perfect candidate for light-matter coupling system. In the current work, we fabricated hybrid systems of MoS2 monolayers [2] and 1D plasmonic nanogrooves made of gold (Au) to study exciton-plasmon coupling, particularly the carrier transport at the coupling state (see Fig. 1(a)). The nanogrooves were suited to excite in-plane plasmons, which are different from metallic-nanoparticle-on-mirror configuration.(/p)(p)The exciton-plasmon couplings were confirmed by the reflectance measurements and the dispersion relations were plotted from the reflectance measurements as shown in Fig. 1(b). In Fig. 1(b), the plasmon-exciton coupling of the upper polariton and lower polariton were plotted as a function of detuning. The splitting energy was as large as 65 meV, which is one of the largest among the values reported so far at room temperature. The exciton-plasmon coupling has also been confirmed by the Kelvin probe force microscope (KPFM) which recorded the surface potentials. As shown in Fig. 1(c), while there was no surface potential change for the MoS2 on planar Au film, a surface potential shift of 13.5 meV was observed for the MoS2 on nanogroove upon laser irradiation at 532 nm. This is a direct evidence that surface potential shift was induced at the exciton-plasmon coupling. Our results indicated that the 1D plasmonic nanogrooves are appropriate structures to study exciton-plasmon coupling with large splitting energy at room temperature.
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Yuksel, Anil, Michael Cullinan, and Jayathi Murthy. "Polarization Effect on Out of Plane Configured Nanoparticle Packing." In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-3075.
Повний текст джерелаАнотація:
Surface plasmon polaritons are associated with the light-nanoparticle interaction and results in high enhancement in the gap between the particles. Indeed, this is affected by particle size, spacing, interlayer distance and light source properties. Polarization effect on three-dimensional (3D) and out of plane nanoparticle packings are presented herein to understand the out of plane configuration effect by using 532 nm plane wave light. This analysis gives insight on the particle interactions between the adjacent layers for multilayer nanoparticle packings. It has been seen that the electric field enhancement is up to 400 folds for TM (Transverse magnetic) or X-polarized light and 26 folds for TE (Transverse electric) or Y-polarized light. Thermo-optical properties change nonlinearly between 0 and 10 nm gap spacing due to the strong and non-local near-field interaction between the particles for the TM polarized light; however, this is linear for TE polarized light. This will give insight on the micro/nano heat transport for the interlayer particles for 100 nm diameter of Cu nanoparticle packings under 532 nm light under different polarization for 3-D interconnect (IC) manufacturing.
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Chittibabu, K. G., L. Li, X. Wang, J. Kumar, and S. K. Tripathy. "Thiophene based Nonlinear Optical Chromophore functionalized Epoxy Polymers for Electro-Optic Applications." In Organic Thin Films for Photonic Applications. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/otfa.1997.thc.4.
Повний текст джерелаАнотація:
Polymeric materials present certain advantages over inorganic crystals for second-order nonlinear optical (NLO) applications because of their low dielectric constant, large optical nonlinearity, low cost, and ease of processability. Stable NLO polymeric materials are potential candidates for electro-optic (EO) devices such as high bandwidth electro-optic modulators [1], optical interconnects [2], and fiber optic gyros [3]. Second-order NLO properties in polymers are present when the chromophores are aligned in a non-centrosymmetric manner. Chromophores with enhanced NLO susceptibilities can be obtained by increasing electron-donating and/or accepting effects [4], by extending the conjugation length between the donor and acceptor groups [5] and by replacing the phenyl moieties in the chromophores with thiophene moieties [6]. Efforts were made by our group [7] and various other groups [6, 8] to synthesize and optimize the properties of the chromophore functionalized polymers with high optical nonlinearity. Jen and coworkers synthesized a variety of thiophene based chromophores with high optical nonlinearity, 'μβ' [6, 8]. Many of these chromophores, when doped in a polymer matrix exhibited an electro-optic value greater than 20 pm/V. Marder and coworkers studied the effect of strong acceptors in NLO chromophores and have found that an 'r33' value of 55 pm/V at 1.313 μm is realizable with some of these chromophore doped polycarbonate composites. However, most of these systems are of guest-host type, which limit the chromophore solubility as well as temporal stability of the poled order in the NLO chromophore-polymer composites.
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Kobe, Andrej, and Janez Možina. "Novel optical fiber absorption sensor based on fluorescence lifetime encoding." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cwp6.
Повний текст джерелаАнотація:
Advantages of lifetime based sensors (for temperature etc.) compared to intensity sensors have been thoroughly presented in terms of intrinsicaly stable and reference-free measurements1. There is however a limited number of materials that have strong fluorescence lifetime dependence on desired physical or chemical property of the environment. Even smaller subset have properties such as long lifetime, high quantum efficiency and chemical stability that enable long term adecquate SNR with simple electronics and design. Vast majority of fiber optic sensors is intensity based, so the possibility of encoding absorption in the measured material in a time-dependent signal with all the advantages of a lifetime based sensors is highly desired.
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Nayak, Sudhanshu Kumar, Md Soif Ahmed, Someshwar Pola, Dipanjan Banerjee, Venugopal Rao Soma, Prabhakar Chetti, and Sai Santosh Kumar Raavi. "Ultrafast Nonlinear Optical Studies of Polycyclic Aromatic Hydrocarbon (PAHs) based Benzo[b]naphtho[1,2,3,4-pqr] Perylene using Femtosecond Z-scan." In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jtu4b.15.
Повний текст джерелаАнотація:
The ultrafast nonlinear optical properties of Polycyclic aromatic hydrocarbon (PAHs) based benzo[b]perylene derivative named as benzo[b]naphtho[1,2,3,4-pqr]perylene (BNP) are studied using femtosecond Z-scan at 800 nm. A strong three-photon absorption coefficient of 0.56×10-5 cm3/GW2 was observed.
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Abbate, G., F. Castaldo, L. De Stefano, P. Mormile, and E. Santamato. "TM nonlinear modes in a liquid crystal optical waveguide." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.cwf96.
Повний текст джерелаАнотація:
Liquid Crystals (LCs) are by far extensively studied in integrateci optics because of their exceptional mechanical and optical properties, and a lot of optical devices for guided optics, based on linear and nonlinear effects in these materials, have been proposed.1 Efficient control of the guided light can be obtained, for example, acting on the LC placed in the substrate2,4 or in the core3 of a slab waveguide with an external (electric, mag netic, or optical) field. In this work, instead, we study the self action of an intense optical field propagating in the waveguide core made of a liquid crystal material. Strong planar alignment of the LC molecules is assumed at the walls and only TM modes are considered. (It can be shown that, above a critical threshold of the guided power, such a nonlinear structure cannot support pure TE modes.) Moreover, the waveguide is assumed to be symmetric, so that only even or odd modes are supported.
Звіти організацій з теми "Plasmon-based strong optical properties"
1
Tuller, Markus, Asher Bar-Tal, Hadar Heller, and Michal Amichai. Optimization of advanced greenhouse substrates based on physicochemical characterization, numerical simulations, and tomato growth experiments. United States Department of Agriculture, January 2014. http://dx.doi.org/10.32747/2014.7600009.bard.
Повний текст джерелаАнотація:
Over the last decade there has been a dramatic shift in global agricultural practice. The increase in human population, especially in underdeveloped arid and semiarid regions of the world, poses unprecedented challenges to production of an adequate and economically feasible food supply to undernourished populations. Furthermore, the increased living standard in many industrial countries has created a strong demand for high-quality, out-of-season vegetables and fruits as well as for ornamentals such as cut and potted flowers and bedding plants. As a response to these imminent challenges and demands and because of a ban on methyl bromide fumigation of horticultural field soils, soilless greenhouse production systems are regaining increased worldwide attention. Though there is considerable recent empirical and theoretical research devoted to specific issues related to control and management of soilless culture production systems, a comprehensive approach that quantitatively considers all relevant physicochemical processes within the growth substrates is lacking. Moreover, it is common practice to treat soilless growth systems as static, ignoring dynamic changes of important physicochemical and hydraulic properties due to root and microbial growth that require adaptation of management practices throughout the growth period. To overcome these shortcomings, the objectives of this project were to apply thorough physicochemical characterization of commonly used greenhouse substrates in conjunction with state-of-the-art numerical modeling (HYDRUS-3D, PARSWMS) to not only optimize management practices (i.e., irrigation frequency and rates, fertigation, container size and geometry, etc.), but to also “engineer” optimal substrates by mixing organic (e.g., coconut coir) and inorganic (e.g., perlite, pumice, etc.) base substrates and modifying relevant parameters such as the particle (aggregate) size distribution. To evaluate the proposed approach under commercial production conditions, characterization and modeling efforts were accompanied by greenhouse experiments with tomatoes. The project not only yielded novel insights regarding favorable physicochemical properties of advanced greenhouse substrates, but also provided critically needed tools for control and management of containerized soilless production systems to provide a stress-free rhizosphere environment for optimal yields, while conserving valuable production resources. Numerical modeling results provided a more scientifically sound basis for the design of commercial greenhouse production trials and selection of adequate plant-specific substrates, thereby alleviating the risk of costly mistrials.
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STUDY ON STATIC AND DYNAMIC EXPERIMENT OF SPATIAL CABLE-TRUSS STRUCTURE WITHOUT INNER RING CABLES BASED ON GRID-JUMPED LAYOUT OF STRUTS. The Hong Kong Institute of Steel Construction, December 2022. http://dx.doi.org/10.18057/ijasc.2022.18.4.6.
Повний текст джерелаАнотація:
Cable-truss tensile structures are one of the most imperative types of spatial structures, and a spatial cable-truss structure without inner ring cables (SCSWIRC) is a new type of cable-truss tensile structure. Although SCSWIRC has a strong anti-collapse capacity, its construction forming is difficult. Based on the concept of grid-jumped layout for struts, the experimental model with a span of 6 m is designed, and then three grid-jumped layout schemes are proposed to simplify structure system. The static and dynamic properties of experimental and finite element models are systematically studied. The results show that experimental values agree with simulation values. The errors of the static experiment are in the range of 6%~11.53% and the errors of the dynamic experiment are in the range of 5%~8%. The grid-jumped layout has negligible effects on the internal forces of cables. However, it has excellent effects on the internal forces of struts and nodal displacements at the grid-jumped layout, so the mechanical property of struts needs to be rechecked after grid-jumped layout. The mechanical property of the optimal grid-jumped layout scheme does not change compared with original scheme. The optimal grid-jumped layout scheme not only simplifies SCSWIRC, but also reduces the amount of steel. The study can promote the application of SCSWIRC in practical engineering.