Готові списки джерел за темами / Plasmonic spectral gap

Добірка наукової літератури з теми "Plasmonic spectral gap"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Plasmonic spectral gap"

Lerch, Sarah, and Björn M. Reinhard. "Spectral signatures of charge transfer in assemblies of molecularly-linked plasmonic nanoparticles." International Journal of Modern Physics B 31, no. 24 (September 30, 2017): 1740002. http://dx.doi.org/10.1142/s0217979217400021.

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Self-assembly of functionalized nanoparticles (NPs) provides a unique class of nanomaterials for exploring and utilizing quantum-plasmonic effects that occur if the interparticle separation between NPs approaches a few nanometers and below. We review recent theoretical and experimental studies of plasmon coupling in self-assembled NP structures that contain molecular linkers between the NPs. Charge transfer through the interparticle gap of an NP dimer results in a significant blue-shift of the bonding dipolar plasmon (BDP) mode relative to classical electromagnetic predictions, and gives rise to new coupled plasmon modes, the so-called charge transfer plasmon (CTP) modes. The blue-shift of the plasmon spectrum is accompanied by a weakening of the electromagnetic field in the gap of the NPs. Due to an optical far-field signature that is sensitive to charge transfer across the gap, plasmonic molecules represent a sensor platform for detecting and characterizing gap conductivity in an optical fashion and for characterizing the role of molecules in facilitating the charge transfer across the gap.

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Aigner, Andreas, Stefan Maier, and Haoran Ren. "Topological-Insulator-Based Gap-Surface Plasmon Metasurfaces." Photonics 8, no. 2 (February 4, 2021): 40. http://dx.doi.org/10.3390/photonics8020040.

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Topological insulators (TIs) have unique highly conducting symmetry-protected surface states while the bulk is insulating, making them attractive for various applications in condensed matter physics. Recently, topological insulator materials have been tentatively applied for both near- and far-field wavefront manipulation of electromagnetic waves, yielding superior plasmonic properties in the ultraviolet (UV)-to-visible wavelength range. However, previous reports have only demonstrated inefficient wavefront control based on binary metasurfaces that were digitalized on a TI thin film or non-directional surface plasmon polariton (SPP) excitation. Here, we numerically demonstrated the plasmonic capabilities of the TI Bi2Te3 as a material for gap–surface plasmon (GSP) metasurfaces. By employing the principle of the geometric phase, a far-field beam-steering metasurface was designed for the visible spectrum, yielding a cross-polarization efficiency of 34% at 500 nm while suppressing the co-polarization to 0.08%. Furthermore, a birefringent GSP metasurface design was studied and found to be capable of directionally exciting SPPs depending on the incident polarization. Our work forms the basis for accurately controlling the far- and near-field responses of TI-based GSP metasurfaces in the visible spectral range.

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El-Aasser, Mostafa A., and Safwat A. Mahmoud. "Spectral Properties of Plasmonic Vertical Nano-Gap Array Resonators." Journal of Nanoelectronics and Optoelectronics 14, no. 3 (March 1, 2019): 420–24. http://dx.doi.org/10.1166/jno.2019.2506.

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Hooshmand, Nasrin, and Mostafa A. El-Sayed. "Collective multipole oscillations direct the plasmonic coupling at the nanojunction interfaces." Proceedings of the National Academy of Sciences 116, no. 39 (September 5, 2019): 19299–304. http://dx.doi.org/10.1073/pnas.1909416116.

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We present a systematic study of the effect of higher-multipolar order plasmon modes on the spectral response and plasmonic coupling of silver nanoparticle dimers at nanojunction separation and introduce a coupling mechanism. The most prominent plasmonic band within the extinction spectra of coupled resonators is the dipolar coupling band. A detailed calculation of the plasmonic coupling between equivalent particles suggests that the coupling is not limited to the overlap between the main bands of individual particles but can also be affected by the contribution of the higher-order modes in the multipolar region. This requires an appropriate description of the mechanism that goes beyond the general coupling phenomenon introduced as the plasmonic ruler equation in 2007. In the present work, we found that the plasmonic coupling of nearby Ag nanocubes does not only depend on the plasmonic properties of the main band. The results suggest the decay length of the higher-order plasmon mode is more sensitive to changes in the magnitude of the interparticle axis and is a function of the gap size. For cubic particles, the contribution of the higher-order modes becomes significant due to the high density of oscillating dipoles localized on the corners. This gives rise to changes in the decay length of the plasmonic ruler equation. For spherical particles, as the size of the particle increases (i.e., ≥80 nm), the number of dipoles increases, which results in higher dipole–multipole interactions. This exhibits a strong impact on the plasmonic coupling, even at long separation distances (20 nm).

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de Nijs, Bart, Richard W. Bowman, Lars O. Herrmann, Felix Benz, Steve J. Barrow, Jan Mertens, Daniel O. Sigle, et al. "Unfolding the contents of sub-nm plasmonic gaps using normalising plasmon resonance spectroscopy." Faraday Discussions 178 (2015): 185–93. http://dx.doi.org/10.1039/c4fd00195h.

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Plasmonic coupling of gold nanoparticles to a gold surface creates intense plasmonic hot spots with large electromagnetic field-enhancements within the cavity formed by the two metallic surfaces. The localised field in such structures is extremely sensitive to morphological fluctuations and subtle changes in the dielectric properties of the cavity contents. Here, we present an optical method that pins down the properties of the gap contents with high sensitivity, termed normalising plasmon resonance (NPR) spectroscopy. We use this on a variety of ultrathin molecular spacers such as filled and empty cucurbiturils, and graphene. Clear differences in the spectral positions and intensities of plasmonic modes observed in the scattering spectrum resolve thickness differences of 0.1 nm, and refractive index changes from molecular filling.

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Park, Jongkyoon, Hyunsoo Lee, Alexander Gliserin, Kyujung Kim, and Seungchul Kim. "Spectral Shifting in Extraordinary Optical Transmission by Polarization-Dependent Surface Plasmon Coupling." Plasmonics 15, no. 2 (November 16, 2019): 489–94. http://dx.doi.org/10.1007/s11468-019-01058-w.

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AbstractNanoapertures in a metallic film exhibit extraordinary optical transmission (EOT) owing to the surface plasmon resonance. Their transmission properties are known to be dependent on the structural parameters of the nanoapertures. In addition, the polarization of light has also a crucial influence on the transmission spectrum. In this study, we numerically found that the polarization state is a sensitive parameter in plasmonic EOT only when the gap size between triangular nanoapertures is less than ~ 20 nm. For a polarization of the light perpendicular to the axis between the nanoapertures, the optical transmission spectrum is nonlinearly redshifted with decreasing gap size. This spectral shifting of the transmission has potential applications for active optical filters, which can be manipulated by the polarization of light or by adjusting the gap size.

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Li, Guang-Can, Qiang Zhang, Stefan A. Maier, and Dangyuan Lei. "Plasmonic particle-on-film nanocavities: a versatile platform for plasmon-enhanced spectroscopy and photochemistry." Nanophotonics 7, no. 12 (November 26, 2018): 1865–89. http://dx.doi.org/10.1515/nanoph-2018-0162.

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AbstractMetallic nanostructures with nanometer gaps support hybrid plasmonic modes with an extremely small mode volume and strong local field intensity, which constitutes an attractive plasmonic platform for exploring novel light-matter interaction phenomena at the nanoscale. Particularly, the plasmonic nanocavity formed by a metal nanoparticle closely separated from a thin metal film has received intensive attention in the nanophotonics community, largely attributed to its ease of fabrication, tunable optical properties over a wide spectral range, and the ultrastrong confinement of light at the small gap region scaled down to sub-nanometer. In this article, we review the recent exciting progress in exploring the plasmonic properties of such metal particle-on-film nanocavities (MPoFNs), as well as their fascinating applications in the area of plasmon-enhanced imaging and spectroscopies. We focus our discussion on the experimental fabrication and optical characterization of MPoFNs and the theoretical interpretation of their hybridized plasmon modes, with particular interest on the nanocavity-enhanced photoluminescence and Raman spectroscopies, as well as photocatalysis and molecular nanochemistry.

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Zhang, Tianyue, Jian Xu, Zi-Lan Deng, Dejiao Hu, Fei Qin, and Xiangping Li. "Unidirectional Enhanced Dipolar Emission with an Individual Dielectric Nanoantenna." Nanomaterials 9, no. 4 (April 18, 2019): 629. http://dx.doi.org/10.3390/nano9040629.

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Light manipulation at the nanoscale is the vanguard of plasmonics. Controlling light radiation into a desired direction in parallel with high optical signal enhancement is still a challenge for designing ultracompact nanoantennas far below subwavelength dimensions. Here, we theoretically demonstrate the unidirectional emissions from a local nanoemitter coupled to a hybrid nanoantenna consisting of a plasmonic dipole antenna and an individual silicon nanorod. The emitter near-field was coupled to the dipolar antenna plasmon resonance to achieve a strong radiative decay rate modification, and the emitting plasmon pumped the multipoles within the silicon nanorod for efficient emission redirection. The hybrid antenna sustained a high forward directivity (i.e., a front-to-back ratio of 30 dB) with broadband operating wavelengths in the visible range (i.e., a spectral bandwidth of 240 nm). This facilitated a large library of plasmonic nanostructures to be incorporated, from single element dipole antennas to gap antennas. The proposed hybrid optical nanorouter with ultracompact structural dimensions of 0.08 λ2 was capable of spectrally sorting the emission from the local point source into distinct far-field directions, as well as possessing large emission gains introduced by the nanogap. The distinct features of antenna designs hold potential in the areas of novel nanoscale light sources, biosensing, and optical routing.

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Gerislioglu, Burak, and Arash Ahmadivand. "Functional Charge Transfer Plasmon Metadevices." Research 2020 (January 30, 2020): 1–18. http://dx.doi.org/10.34133/2020/9468692.

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Reducing the capacitive opening between subwavelength metallic objects down to atomic scales or bridging the gap by a conductive path reveals new plasmonic spectral features, known as charge transfer plasmon (CTP). We review the origin, properties, and trending applications of this modes and show how they can be well-understood by classical electrodynamics and quantum mechanics principles. Particularly important is the excitation mechanisms and practical approaches of such a unique resonance in tailoring high-response and efficient extreme-subwavelength hybrid nanophotonic devices. While the quantum tunneling-induced CTP mode possesses the ability to turn on and off the charge transition by varying the intensity of an external light source, the excited CTP in conductively bridged plasmonic systems suffers from the lack of tunability. To address this, the integration of bulk plasmonic nanostructures with optothermally and optoelectronically controllable components has been introduced as promising techniques for developing multifunctional and high-performance CTP-resonant tools. Ultimate tunable plasmonic devices such as metamodulators and metafilters are thus in prospect.

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Mennucci, Carlo, Debasree Chowdhury, Giacomo Manzato, Matteo Barelli, Roberto Chittofrati, Christian Martella, and Francesco Buatier de Mongeot. "Large-area flexible nanostripe electrodes featuring plasmon hybridization engineering." Nano Research 14, no. 3 (October 21, 2020): 858–67. http://dx.doi.org/10.1007/s12274-020-3125-x.

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AbstractMultifunctional flexible Au electrodes based on one-dimensional (1D) arrays of plasmonic gratings are nanofabricated over large areas with an engineered variant of laser interference lithography optimized for low-cost transparent templates. Au nanostripe (NS) arrays achieve sheet resistance in the order of 20 Ohm/square on large areas (∼ cm2) and are characterized by a strong and dichroic plasmonic response which can be easily tuned across the visible (VIS) to near-infrared (NIR) spectral range by tailoring their cross-sectional morphology. Stacking vertically a second nanostripe, separated by a nanometer scale dielectric gap, we form near-field coupled Au/SiO2/Au dimers which feature hybridization of their localized plasmon resonances, strong local field-enhancements and a redshift of the resonance towards the NIR range. The possibility to combine excellent transport properties and optical transparency on the same plasmonic metasurface template is appealing in applications where low-energy photon management is mandatory like e.g., in plasmon enhanced spectroscopies or in photon harvesting for ultrathin photovoltaic devices. The remarkable lateral order of the plasmonic NS gratings provides an additional degree of freedom for tailoring the optical response of the multifunctional electrodes via the excitation of surface lattice resonances, a Fano-like coupling between the broad localised plasmonic resonances and the collective sharp Rayleigh modes.

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Більше джерел

Дисертації з теми "Plasmonic spectral gap"

Liu, Wei. "Light manipulation by plasmonic nanostructures." Phd thesis, 2013. http://hdl.handle.net/1885/10308.

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This thesis studies various effects based on the excitation of surfaces plasmons in various plasmonic nanostructures. We start the thesis with a general introduction of the field of plasmonics in Chapter 1. In this chapter we discuss both propagating surface plasmon polaritons (SPPs) and localized surface plasmons (LSPs), how they are related to each other through the Bohr condition, the features of subwavelength confinement and near-field enhancement, and wave guidance through coupled LSPs. Then after the discussion of the achievements and challenges in this field (Section 1.3) we will outline the basic structure of the thesis at the end of this chapter (Section 1.4). In Chapter 2 we demonstrate a new mechanism to achieve complete spectral gap without periodicity along propagation direction based on the coupling of backward and forward modes supported by plasmonic nanostructures. We study the backward modes in single cylindrical plasmonic structures (Section 2.2) and focus on the two simplest cases: nanowires and nanocavities. Afterwards, we demonstrate how to achieve spectral gaps in coupled plasmonic nanocavities (Section 2.3). A polarization-dependent spectral gap is achieved firstly in two coupled nanocavities which support forward and backward modes respectively (Section 2.3.1). At the end we demonstrate a complete spectral gap, which is induced by the symmetry of a four-coupled-nanocavity system (Section 2.3.2). In Chapter 3 we study beam shaping in plasmonic potentials. Based on the similarity between Schrodinger equation for matter waves and paraxial wave equation for photons, we introduce the concept of plasmonic potentials and demonstrate how to obtain different kinds of potentials for SPPs in various modulated metal-dielectric-metal (MDM) structures. We investigate firstly the parabolic potentials in quadratically modulated MDM and the beam manipulations in such potentials, including polychromatic nanofocusing in full parabolic potentials (Section 3.2.1), plasmonic analogue of quantum paddle balls in half parabolic potentials (Section 3.2.2), and adiabatic nanofocusing in tapered parabolic potentials (Section 3.2.3). In the following section (Section 3.3) we show the existence of linear plasmonic potentials in wedged MDM and efficient steering of the Airy beams in such potentials (Section 3.3.2) after a brief introduction on Airy beams in free space (Section 3.3.1). In Chapter 4 we study scattering engineering by magneto-dielectric core-shell nanostructures. The introduction part (Section 4.1) gives a brief overview on the scattering of solely electric dipole (ED) or magnetic dipole (MD), and how the coexistence and interference of the ED and the MD can bring extra flexibility for scattering shaping. Afterwards, we discuss the scattering shaping by core-shell nanostructures through the interferences of electric and artificial magnetic dipoles (Section 4.2), including two examples of broadband unidirectional scattering by core-shell nanospheres (Section 4.2.1) and efficient scattering pattern shaping of core-shell nanowires (Section 4.2.2). At the end of this chapter we demonstrate polarization independent Fano resonances in arrays of core-shell nanospheres (Section 4.3.2). At the end of this thesis (Chapter 5) we summarize the results and draw the conclusions. We also discuss the challenges and possible future developments of the field of plasmonics.

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Sivis, Murat. "Extreme-ultraviolet light generation in plasmonic nanostructures." Doctoral thesis, 2013. http://hdl.handle.net/11858/00-1735-0000-0022-5E08-0.

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Частини книг з теми "Plasmonic spectral gap"

Kresin, Vladimir Z., Sergei G. Ovchinnikov, and Stuart A. Wolf. "Materials (II)." In Superconducting State, 309–62. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198845331.003.0007.

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This chapter describes the properties of a number of interesting superconducting materials. The study of phonon-mediated superconductors, such as A-15 materials and MgB₂, flourished after the discovery of the high-Tc hydrides. At present, this family displays, under high pressure, record values of Tc close to room temperature. Other interesting systems, such as pnictides, heavy fermions, and ruthenates, with their peculiar interplay of superconductivity and magnetism, are also described. Fe-based superconductors, which were recently discovered, have relatively high Tc at ambient pressure. They display a two-gap energy spectrum. Pairing in intercalated nitrides is mainly provided by acoustic plasmons. Tungsten oxides represent a new family of oxides containing elements other than copper; they form filamentary structures. A special class is formed by topological superconductors; usually their properties are caused by odd-parity pairing. The presence of the states inside of the energy gap make these superconductors similar to topological insulators.

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Тези доповідей конференцій з теми "Plasmonic spectral gap"

Reinhard, B., G. Torosyan, and R. Beigang. "Plasmonic band gap materials for the terahertz spectral region." In Photonic Metamaterials: From Random to Periodic. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/meta.2007.tub28.

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Dayal, Govind, Ikki Morichika, and Satoshi Ashihara. "Vibrational strong coupling between molecular vibration and subwavelength plasmonic cavity supporting gap plasmon mode." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2019. http://dx.doi.org/10.1364/jsap.2019.18a_e208_2.

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We report on strong coupling between molecular vibrational resonances of polymethyl methacrylate (PMMA) molecules and gap plasmon resonance of an ultrathin plasmonic cavity in the midinfrared range. The strong coupling is achieved when the molecular vibrational mode and plasmonic cavity exchange energy faster than their relaxation rates and it is maximum when two relaxation rates are equal [1]. In this work, we designed, fabricated and characterized a composite medium consisting of a thin PMMA layer sandwiched between the nanoantenna array and a continuous metallic thin film to achieve vibration strong coupling. The spectral position and the relaxation rate of gap plasmonic resonance are tuned through the molecular resonance of the PMMA molecules (at 1730 cm−1) to go from weak to strong coupling regime. Strong coupling between vibrational modes and gap plasmon mode leads to the formation of new hybrid light-matter states called polaritonic states (@ 1690 cm−1 & 1810 cm−1), separated by the vacuum Rabi splitting (120 cm−1). Thin film coupled nanoantennas with sub-wavelength gaps have shown great potential in nanophotonic applications because they offer the ultimate electric field confinement in the gap. Our work is complementary to earlier work using microcavities and provides a new approach to achieve strong coupling with a nanoscale plasmonic cavity (λ/25) and the possibility to modulate the strong coupling regime by changing the gap thickness of the cavity and the lattice period of the nanoantenna array.

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Pan, DaFa, Ying Li, Shilin Yu, and Tonggang Zhao. "Spectral characteristics of an annular gap plasmonic structure and its application for filters." In International Conference on Optical Instruments and Technology 2019: Micro/Nano Photonics: Materials and Devices, edited by Baojun Li, Xingjun Wang, and Ya Sha Yi. SPIE, 2020. http://dx.doi.org/10.1117/12.2541394.

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Yanagisawa, M., M. Kunimoto, M. Saito, and T. Homma. "HAMR Emulation Using Plasmonic SERS Sensor As Near Field Transducer." In ASME-JSME 2018 Joint International Conference on Information Storage and Processing Systems and Micromechatronics for Information and Precision Equipment. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/isps-mipe2018-8537.

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A plasmonic Surface-enhanced Raman Spectroscopy (SERS) sensor has been used for emulation of Near Field Transducer (NFT) in Heat-Assisted Magnetic Recording (HAMR). Laser heating mechanism by the sensor is the same as that by NFT with electro-magnetic near-field or plasmonic field, which is different from far field heating. Heating behavior for a lubricant film on a carbon overcoat for a hard disk medium was observed using Surface-enhanced Raman Spectroscopy with the plasmonic SERS sensor. Spectral change of lube films in laser heating with a continuous power changer was measured with heating temperature, calculated by anti-Stokes/Stokes intensity ratio in Raman spectra. As a result, it is found that the lubricant film composed of a tetraol perfluoro-polyether (PFPE) is evaporated above 290°C, which shows good agreement with that by TGA (Thermogravimetric Analysis). The evaporation occurs in wide range of spacing between the lubricant film and the SERS sensor from 0 (contact) to 50nm, and more. After laser heating, lubricant film with free surface in a large gap area, i.e. spacing of 3nm, is recovered with elapsed time. However it is difficult to be recovered in confined (contact) area, because lubricant mobility is small. Lost lubricant can be recovered in head flying by surface diffusion or centrifugal force during disk rotation.

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Yanagisawa, M., M. Kunimoto, and T. Homma. "HAMR Emulation on Carbon Overcoat and Lubricant for Near Field Transducer and Magnetic Media Using Surface-Enhanced Raman Sensors." In ASME 2017 Conference on Information Storage and Processing Systems collocated with the ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/isps2017-5431.

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A plasmonic sensor is used for emulation of near field transducer (NFT). Some overcoat films (thickness of 1nm) were coated on Au nanoparticles (NPs) on a convex quartz glass substrate (plasmonic sensor). Heating behavior of the films was examined by laser heating using novel Raman spectroscopic tools, i.e. surface-enhanced Raman scattering (SERS) with the plasmonic sensor, a continuous laser heating tool, in-situ observation of spectra and temperature with a high speed time-resolved measurement. The heating temperature of tetrahedral carbon (ta-C) film in He gas is lower than that in air. This is because the thermal conductivity of He is larger than air. Few spectral change of ta-C film (thickness of 1nm) on Au NP’s is observed except initial change in around 100 s at the temperature around 500 °C, which corresponds to the temperature of the carbon overcoat (COC) for the media temperature of 327 °C (600K, Currie temperature for CoPt alloy). Some carbide films, i.e. SiC, TiC, and WC, showed high heat resistance, that is, few spectral change was observed. It is found that lubricant is evaporated from the COC on magnetic media and transferred to the plasmonic sensor.

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Tóth, E., O. Fekete, B. Bánhelyi, and M. Csete. "Enhancement of lasing via complex plasmonic structures." In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jw4a.89.

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Spectral engineering was realized by tailoring complex patterns of spherical plasmonic nanoresonators achievable via integrated lithography. Enhancement of lasing was demonstrated on Babinet-complementary complex patterns, with multiple spectral peaks at the plasmonic resonances and gaps.

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Chen, Yen-Shin, Bo-Kai Chao, Tadaaki Nagao, and Chun-Hway Hsueh. "Improvement of Photocatalytic Efficiency by Adding Ag Nanoparticles and Reduced Graphene Oxide to TiO2." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2017. http://dx.doi.org/10.1364/jsap.2017.5p_a410_12.

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Titanium dioxide (TiO2) is the commonly used photocatalyst. However, because only a small ultraviolet portion of solar spectrum can excite the electron-hole pairs resulting from the large band gap (3.2 eV) [1] and the recombination rate is high, its efficiency is restrained. To overcome this drawback, we added silver nanoparticles and reduced graphene oxide (RGO) to construct the ternary plasmonic catalyst to improve the catalytic performance of TiO2 nanopowder (P25). We prepared three different geometries of Ag nanostructures including sphere, decahedron and prism because the plasmon resonance properties of Ag could be controlled by the morphology of Ag nanoparticle, which shows characteristic strong localized surface plasmon resonance (LSPR) leading to an increase in light absorption [2]. The incorporated RGO inhibited the charge recombination and enhanced the electron-hole separation. In this study, Ag nanodecahedrons/P25/RGO and Ag nano-prisms/P25/RGO hybrid photocatalysts possessed remarkable photocatalytic activity, which displayed over 8 times higher photocatalytic efficiency than the P25 photocatalyst.

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Grigelionis, I., V. Jakstas, V. Janonis, and I. Kasalynas. "Optimization of Terahertz Emission Spectra of Electrically Pumped 2DEG Plasmonic AlGaN/GaN Heterostructures." In 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2018). IEEE, 2018. http://dx.doi.org/10.1109/irmmw-thz.2018.8510372.

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Bijalwan, Ashish, and Vipul Rastogi. "Refractive Index Sensor based on Multilayered Au-SiO2-Al Structure." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2017. http://dx.doi.org/10.1364/jsap.2017.5a_a410_8.

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The phenomenon of surface plasmon resonance (SPR) is used for detection of biomolecules, medical diagnostics and gas analysis [1]. SPR is an optical phenomenon in which TM polarized light beam excites the surface plasmon polaritons (SPP) at metal-dielectric interface. These polaritons could be excited by grating coupling. Generally, gold (Au), aluminum (Al), and silver (Ag) are used as SPR active material. For a good sensor, very narrow SPR reflection spectrum is required. Al grating offers narrower SPR spectrum but it is chemically less stable. While Au grating is chemically more stable but does not provide narrow SPR spectrum.

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Yuanpei, Xu, and Xuan Yimin. "Light-Harvesting and Photon Management in GaAs Solar Cells for Photovoltaic-Thermoelectric Hybrid Systems." In ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/mnhmt2016-6357.

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The utilization of solar energy in photovoltaics is limited due to the band gap of the materials. Hence, photovoltaic–thermoelectric hybrid system was proposed to utilize solar energy in the full spectrum of AM1.5G. On this basis, a novel design of GaAs solar cell is proposed in this paper for the full spectrum absorption in the cell structure, which consists of an ultra-thin GaAs layer with nanocones on the surface and a nanogrid–AZO–Ag back contact. The Finite Difference Time Domain method is used to analyze the full spectrum absorption features for TE and TM polarizations over the incident angles varying from 0° to 60°. The designed structure shows high absorption in the full spectrum. For GaAs layer, it is shown that the solar usable energy for GaAs solar cells in 300–900nm is absorbed by GaAs almost perfectly due to the anti–reflection property of the nanocone array. The absorbed energy in the back contact in the longer wavelengths over 900nm is due to the Fabry-Perot and the localized plasmonic resonances. The structure can collect full-spectrum incident photons efficiently in GaAs solar cells for the application of photovoltaic–thermoelectric hybrid system.

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