Au Nanocrystal Array/Silicon Nanoantennas as Wavelength-Selective Photoswitches

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• 作者：Yu-Kai Lin ; Heng-Wen Ting ; Chun-Yuan Wang ; Shangjr Gwo ; Li-Jen Chou ; Cho-Jen Tsai ; Lih-Juann Chen
• 刊名：Nano Letters
• 出版年：2013
• 出版时间：June 12, 2013
• 年：2013
• 卷：13
• 期：6
• 页码：2723-2731
• 全文大小：569K
• 年卷期：v.13,no.6(June 12, 2013)
• ISSN：1530-6992

文摘

Au nanocrystal array/silicon nanoantennas exhibiting wavelength-selective photocurrent enhancement were successfully fabricated by a facile and inexpensive method combining colloidal lithography (CL) and a metal-assisted chemical etching (MaCE) process. The localized surface plasmon resonance (LSPR) response and wavelength-selective photocurrent enhancement characteristics were achieved by tuning the depth of immersion of Au nanocrystal arrays in silicon through a MaCE process. The wavelength selectivity of photocurrent enhancement contributed by LSPR induced local field amplification was confirmed by simulated near-field distribution. In addition, it can be integrated to well-developed Si-based manufacturing process. These characteristics make Au nanocrystal array/Si nanoantennas promising as low power-consumption photoswitches and nano-optoelectronic and photonic communication devices.

Keywords:

Localized surface plasmon resonance; photoresponce; metal nanocrystal array; metal-assisted chemical etching; degree of immersion