Materials, Photonic Devices, and Sensors

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

[+] Author Affiliations
Tsung-Han Tsai, Li-Jen Hsiao

National Taiwan University, Graduate Institute of Photonics and Optoelectronics, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan

Ming-Yi Lin

Chung Yuan Christian University, Department of Electronic Engineering, No. 200, Chung Pei Road, Taoyuan 32023, Taiwan

Wing-Kit Choi, Hoang Yan Lin

National Taiwan University, Graduate Institute of Photonics and Optoelectronics, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan

National Taiwan University, Department of Electrical Engineering, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan

Opt. Eng. 55(2), 027104 (Feb 10, 2016). doi:10.1117/1.OE.55.2.027104
History: Received October 15, 2015; Accepted January 8, 2016
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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-Si QDs/Au structure without 1-D Ag grating, due to the strong resonance coupling between the two modes.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Tsung-Han Tsai ; Ming-Yi Lin ; Li-Jen Hsiao ; Wing-Kit Choi and Hoang Yan Lin
"Narrow-band amplified photoluminescence of amorphous silicon quantum dots via the coupling between localized surface plasmon and Fabry-Pérot cavity modes", Opt. Eng. 55(2), 027104 (Feb 10, 2016). ; http://dx.doi.org/10.1117/1.OE.55.2.027104


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