10 February 2016 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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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.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Tsung-Han Tsai, Ming-Yi Lin, Li-Jen Hsiao, Wing-Kit Choi, Hoang Yan Lin, "Narrow-band amplified photoluminescence of amorphous silicon quantum dots via the coupling between localized surface plasmon and Fabry-Pérot cavity modes," Optical Engineering 55(2), 027104 (10 February 2016). https://doi.org/10.1117/1.OE.55.2.027104 . Submission:
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