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Optical Engineering

Narrow-band amplified photoluminescence of amorphous silicon quantum dots via the coupling between localized surface plasmon and Fabry-Pérot cavity modes
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Paper Abstract

We experimentally investigate the multifold intensity enhancement and spectral narrowing of photoluminescence (PL) from amorphous silicon quantum dots (a-Si QDs) embedded in a silicon-rich SiOx film of the Ag/SiOx:a-Si QDs/Au plasmonic nanocavity, through the resonance coupling between the localized surface plasmon (LSP) mode and the Fabry-Pérot (FP) cavity mode, by tuning a one-dimensional (1-D) Ag grating on the top. The LSP resonance can be precisely tuned by adjusting the Ag line widths of the 1-D Ag grating. It is found that the LSP mode strongly couples with the FP cavity mode, resulting in a narrower emission line width and a larger PL enhancement. An optimized Ag grating structure is found to exhibit a narrow emission line width of 15 nm and 2.77-fold enhancement in the PL peak intensity, as compared to an SiOx:a-SiQDs/Au structure without 1-D Ag grating, due to the strong resonance coupling between the two modes.

Paper Details

Date Published: 10 February 2016
PDF: 8 pages
Opt. Eng. 55(2) 027104 doi: 10.1117/1.OE.55.2.027104
Published in: Optical Engineering Volume 55, Issue 2
Show Author Affiliations
Tsung-Han Tsai, National Taiwan Univ. (Taiwan)
Ming-Yi Lin, Chung Yuan Christian Univ. (Taiwan)
Li-Jen Hsiao, National Taiwan Univ. (Taiwan)
Wing-Kit Choi, National Taiwan Univ. (Taiwan)
Hoang Yan Lin, National Taiwan Univ. (Taiwan)

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