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Proceedings Paper

Efficient light trapping with ZnS-Au core-shell random medium
Author(s): Radhika V. Nair; Venkata Siva Gummaluri; Dileep Kottilil; Vijayan C.
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Paper Abstract

Dielectric-plasmonic composite media are interesting systems as far as light trapping is considered owing to their enhanced interaction with light. Core-shell particles are of particular interest due to their strong scattering and geometry-dependent plasmon resonances which are tunable from visible to IR region. Design of random media with such highly scattering particles increases the probability of light getting trapped inside the medium due to the enhanced multiple scattering. Here we investigate the light scattering scenario in ZnS-Au core-shell random medium experimentally and also provide theoretical basis using Finite Difference Time Domain (FDTD) simulations. Back scattering and transmission simulations are carried out at standard wavelengths 405, 445, 532 and 632 nm. Effect of geometry on light scattering is also investigated by varying the aspect ratios of the particles. Scattering and absorption efficiency is calculated for particles in this size range using Mie theory. Strength and tunability of plasmon resonances are explained in terms of plasmon hybridization model. Core shell particles with core radius 100 nm and shell thickness of 6 nm are found to be optimal for light trapping over the entire visible region. Dielectric-plasmonic random media consisting of ZnS-Au core shell particles with optimized aspect ratio appear to be efficient candidate materials for light harvesting, sensing and optoelectronics.

Paper Details

Date Published: 16 September 2016
PDF: 9 pages
Proc. SPIE 9919, Nanophotonic Materials XIII, 99190D (16 September 2016); doi: 10.1117/12.2237106
Show Author Affiliations
Radhika V. Nair, Indian Institute of Technology Madras (India)
Venkata Siva Gummaluri, Indian Institute of Technology Madras (India)
Dileep Kottilil, Indian Institute of Technology Madras (India)
Vijayan C., Indian Institute of Technology Madras (India)

Published in SPIE Proceedings Vol. 9919:
Nanophotonic Materials XIII
Stefano Cabrini; Gilles Lérondel; Adam M. Schwartzberg; Taleb Mokari, Editor(s)

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