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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 23 — Dec. 1, 2013
  • pp: 4943–4945

High-efficiency light-trapping effect using silver nanoparticles on thin amorphous silicon subwavelength structure

Chee Leong Tan and Yong Tak Lee  »View Author Affiliations

Optics Letters, Vol. 38, Issue 23, pp. 4943-4945 (2013)

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In this Letter, we experimentally demonstrate a hybrid structure consisting of metal nanoparticles deposited onto a subwavelength structure (SWS), which further increases the absorption of thin amorphous silicon (a-Si) and can possibly lead to a reduction in the minimum required thickness of the a-Si layer. Experimental results show that backscattering of the silver nanoparticles (Ag NPs) deposited on the top surface can be suppressed dramatically (by 85.5%) by the Ag NPs deposited on the SWS. We also experimentally prove that the thin a-Si SWS only lowers the surface reflectivity and does not increase the absorption rate of the material. The absorption of the thin a-Si layer can be increased by depositing Ag NPs onto a thin a-Si SWS, which not only reduces the backscattering of the metal NPs but also increases the light-trapping effect within thin a-Si through localized surface plasmon resonance properties. This decrease of reflection and increase in the light-trapping effect of Ag NPs on cone-shaped thin a-Si SWSs leads to extremely high average absorption (86.14%) within a 400 nm thick a-Si layer.

© 2013 Optical Society of America

OCIS Codes
(160.4760) Materials : Optical properties
(240.6680) Optics at surfaces : Surface plasmons
(290.5850) Scattering : Scattering, particles
(310.1210) Thin films : Antireflection coatings

ToC Category:

Original Manuscript: September 2, 2013
Revised Manuscript: October 22, 2013
Manuscript Accepted: October 24, 2013
Published: November 19, 2013

Chee Leong Tan and Yong Tak Lee, "High-efficiency light-trapping effect using silver nanoparticles on thin amorphous silicon subwavelength structure," Opt. Lett. 38, 4943-4945 (2013)

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