Ms. Rufina S. Sesuraj Profile

Rufina S. Sesuraj

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Proceedings Article | 9 October 2012 Paper

Spectral tunability of plasmonic scattering by silver nanodiscs near a reflector

R. Sesuraj, T. Temple, D. Bagnall

Proceedings Volume 8457, 845721 (2012) https://doi.org/10.1117/12.956502

KEYWORDS: Silver, Plasmonics, Reflectors, Scattering, Silica, Light scattering, Diffuse reflectance spectroscopy, Solar cells, Finite-difference time-domain method, Silicon

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The scattering properties of a plasmonic array can be reinforced by placing the array near a planar reflector. Finite- Difference-Time-Domain (FDTD) simulations have been used to demonstrate the key design challenge of modulating the electric field that drives the plasmonic scattering, by varying the distance of a single Ag nanodisc from a Ag reflector. We show that the thickness of the dielectric separation layer plays a critical role in determining the spectral characteristics and the intensity of the power scattered by a Ag nanodisc near a reflector. A possible application of the designed structure as a plasmonic light-trap for thin Si solar cells is also experimentally demonstrated. Electron-beam lithography has been used to fabricate a pseudo-random array of 150nm plasmonic Ag nanodiscs on SiO₂ on a Ag reflector substrate. The plasmonic reflector shows a high diffuse reflectance of ~54% in the near-infrared, near-bandgap 600-900nm wavelength region for thin Si solar cells, with a low broadband absorption loss of ~18%. Wavelength-angle resolved scattering measurements indicate an angular scattering range between 20° to 80° with maximum intensity of the scattered power in the 20° to 60° angular range.

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