Ms. Yang Pang Profile

Yang Pang

at Northwestern Polytechnical Univ

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Proceedings Article | 20 December 2019 Paper

Plasmonic properties of AuSi and its nanostructures

Yang Pang, Zhiqiang Yang, Kang Du, Wending Zhang, Ting Mei

Proceedings Volume 11209, 1120940 (2019) https://doi.org/10.1117/12.2549219

KEYWORDS: Plasmonics, Absorbance, Silicon, Electrons, Infrared radiation, Nanostructures

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Plasmon-induced hot electrons have attracted a great deal of interest as a novel route for photodetection and light energy harvesting. In this work, we investigate the plasmonic properties of AuSi as a novel plasmonic material for hot-electron infrared photodetection. Calculation by the Bruggeman’s theory shows that the plasma frequency is red-shifted with decreasing gold filling ratio. A plasmonic nanostructure with a periodic grating is then designed for surface plasmon excitation. The absorbance by AuSi can reach 0.87 at a wavelength of 2000nm due to the surface plasmon resonance on metal stripes. The AuSi nano-antenna array is adopted to improve the absorbance up to 95% with polarization independence. AuSi possesses much lower free electron concentration than Au, and thus longer mean free path of hot electrons. With adjustable Schottky barrier, the proposed AuSi-Si hot electron detector may have potential in fields of silicon-based integrated photonics and infrared imaging.

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