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Plasmonic enhancements of photoluminescence in hybrid Si nanostructures with Au fabricated by fully top-down lithography

Koudo Nakaji1, Hao Li1, Takayuki Kiba13, Makoto Igarashi2, Seiji Samukawa23 and Akihiro Murayama13*

Author Affiliations

1 Graduate School of Information Science and Technology, Hokkaido University, Kita 14, Nishi 9, Kita-ku, Sapporo, 060-0814, Japan

2 Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan

3 Japan Science and Technology Agency, CREST, 5 Sanbancho, Chiyoda, Tokyo, 102-0075, Japan

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Nanoscale Research Letters 2012, 7:629  doi:10.1186/1556-276X-7-629

Published: 16 November 2012

Abstract

The authors study plasmonic enhancements of photoluminescence (PL) in Si nanodisk (ND) arrays hybridized with nanostructures such as nanoplates of Au, where these hybrid nanostructures are fabricated by fully top-down lithography: neutral-beam etching using bio-nano-templates and high-resolution electron-beam lithography. The separation distance between the Si ND and Au nanostructure surfaces is precisely controlled by inserting a thin SiO2 layer with a thickness of 3 nm. We observe that PL intensities in the Si NDs are enhanced by factors up to 5 depending on the wavelength by integrating with the Au nanoplates. These enhancements also depend on the size and shape of the Au nanoplates.

Keywords:
Au; Bio-nano-templates; Electron-beam lithography; Hybrid nanostructures; Neutral-beam etching; Plasmonic enhancements; Photoluminescence; Si nanodisk