title: Au nanocrystal array/silicon nanoantennas as wavelength-selective photoswitches.
abstract: 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.
authors.affiliation: Department of Materials Science and Engineering, National Tsing Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu 30013, Taiwan.
authors.forename: Yu-Kai
authors.initials: YK
authors.lastname: Lin
authors.forename: Heng-Wen
authors.initials: HW
authors.lastname: Ting
authors.forename: Chun-Yuan
authors.initials: CY
authors.lastname: Wang
authors.forename: Shangjr
authors.initials: S
authors.lastname: Gwo
authors.forename: Li-Jen
authors.initials: LJ
authors.lastname: Chou
authors.forename: Cho-Jen
authors.initials: CJ
authors.lastname: Tsai
authors.forename: Lih-Juann
authors.initials: LJ
authors.lastname: Chen