Plasmonic properties of AuSi and its nanostructures

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

doi:10.1117/12.2549219

20 December 2019 Plasmonic properties of AuSi and its nanostructures

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

Proceedings Volume 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019); 1120940 (2019) https://doi.org/10.1117/12.2549219
Event: Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 2019, Xi'an, China

Abstract

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.

Citation Download Citation

Yang Pang, Zhiqiang Yang, Kang Du, Wending Zhang, and Ting Mei "Plasmonic properties of AuSi and its nanostructures", Proc. SPIE 11209, Eleventh International Conference on Information Optics and Photonics (CIOP 2019), 1120940 (20 December 2019); https://doi.org/10.1117/12.2549219

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