Material effects on V-nanoantenna performance

Earl, Stuart K.; Gómez, Daniel E.; James, Timothy D.; Davis, Timothy J.; Roberts, Ann

doi:10.1039/c4nr06650b

Cited by 3 publications

(2 citation statements)

References 40 publications

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“…This numerical approach exceeds the possibilities that are feasible with experiments. As long as not otherwise specified, we present the results for an oxide thickness of 3 nm, which is a valid assumption [28,29]. Other thicknesses used in our simulations changed the results quantitatively but not qualitatively.…”

Section: Resultsmentioning

confidence: 81%

Oxide mediated spectral shifting in aluminum resonant optical antennas

Schwab¹,

Moosmann²,

Dopf³

et al. 2015

Opt. Express

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Abstract:As a key feature among metals showing good plasmonic behavior, aluminum extends the spectrum of achievable plasmon resonances of optical antennas into the deep ultraviolet. Due to degradation, a native oxide layer gives rise to a metal-core/oxide-shell nanoparticle and influences the spectral resonance peak position. In this work, we examine the role of the underlying processes by applying numerical nanoantenna models that are experimentally not feasible. Finite-difference time-domain simulations are carried out for a large variety of elongated single-arm and two-arm gap nanoantennas. In a detailed analysis, which takes into account the varying surface-to-volume ratio, we show that the overall spectral shift toward longer wavelengths is mainly driven by the higher index surrounding material rather than by the decrease of the initial aluminum volume. In addition, we demonstrate experimentally that this shifting can be minimized by an all-inert fabrication and subsequent proof-of-concept encapsulation.

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Section: Resultsmentioning

confidence: 81%

Oxide mediated spectral shifting in aluminum resonant optical antennas

Schwab¹,

Moosmann²,

Dopf³

et al. 2015

Opt. Express

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show abstract

“…Due to the fact that amorphous silicon (Si) is widely used in thin-film solar cells, many of the plasmonics-related thin-film studies have concentrated on such systems [9,10]. Different levels of theory have been applied to various plasmonic device structures and materials [9,14,15], including the popular investigations where the surface of a semi-infinite substrate is mimicking the plasmonic device [7,8,16]. Plasmonic nanoparticles have also been applied to (single-crystal) silicon-oninsulator (SOI) photodetector and solar cell structures [1,10,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Influence of Substrate on Plasmon-Induced Absorption Enhancements

et al. 2015

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A set of periodic plasmonic nanostructures is designed and fabricated as a means to investigate light absorption in single-crystal silicon thin-film structures with siliconon-insulator (SOI) wafers as a model system. It is shown both computationally and experimentally that plasmon-induced absorption enhancement is remarkably higher for such devices than for thick or semi-infinite structures or for the thin-film amorphous silicon solar cells reported in the literature. Experimental photocurrent enhancements of the orders of 12 and 20 are demonstrated for non-optimized 2200-nm-thick photoconductive and 300-nm-thick photovoltaic test structures, respectively. Theoretical absorption enhancements as high as 80 are predicted to be achievable for the similar structures. The features of the spectral enhancements observed are attributed to several interacting resonance phenomena: not just to the favourable scattering of light by the periodic plasmonic nanoparticle arrays into the SOI device layer and coupling to the waveguide modes interacting with the plasmonic array but also to the Fabry-Pérot type interferences in the layered structure. We show that the latter effect gives a significant contribution to the spectral features of the enhancements, although frequently ignored in the discussions of previous reports.

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Switchable polarization rotation of visible light using a plasmonic metasurface

et al. 2016

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A metasurface comprising an array of silver nanorods supported by a thin film of the phase change material vanadium dioxide is used to rotate the primary polarization axis of visible light at a pre-determined wavelength. The dimensions of the rods were selected such that, across the two phases of vanadium dioxide, the two lateral localized plasmon resonances (in the plane of the metasurface) occur at the same wavelength. Illumination with linearly polarized light at 45° to the principal axes of the rod metasurface enables excitation of both of these resonances. Modulating the phase of the underlying substrate, we show that it is possible to reversibly switch which axis of the metasurface is resonant at the operating wavelength. Analysis of the resulting Stokes parameters indicates that the orientation of the principal linear polarization axis of the reflected signal is rotated by 90° around these wavelengths. Dynamic metasurfaces such as these have the potential to form the basis of an ultra-compact, low-energy multiplexer or router for an optical signal.

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Material effects on V-nanoantenna performance

Cited by 3 publications

References 40 publications

Oxide mediated spectral shifting in aluminum resonant optical antennas

Oxide mediated spectral shifting in aluminum resonant optical antennas

Influence of Substrate on Plasmon-Induced Absorption Enhancements

Switchable polarization rotation of visible light using a plasmonic metasurface

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