Absorption enhancement of dielectric metasurfaces with the Kerker effect (Conference Presentation)

Chi-Yin Yang; Jhen-Hong Yang; Zih-Ying Yang; Zhong-Xing Zhou; Viktoriia Babicheva; Kuo-Ping Chen

doi:10.1117/12.2320406

17 September 2018 Absorption enhancement of dielectric metasurfaces with the Kerker effect (Conference Presentation)

Chi-Yin Yang, Jhen-Hong Yang, Zih-Ying Yang, Zhong-Xing Zhou, Viktoriia Babicheva, Kuo-Ping Chen

Proceedings Volume 10722, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVI; 107221V (2018) https://doi.org/10.1117/12.2320406
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

High-refractive-index (HRI) dielectric metasurfaces have attracted a lot of attention recently due to their advantages of low non-radiative losses and high melting temperatures. Silicon is one of feasible HRI materials that has been widely used in solar cells, photonic waveguides, and photon detectors. However, the band-gap ~ 1 eV makes the quantum efficiency of silicon low at near-infrared (NIR) wavelengths. In this work, a high absorptance device is proposed and realized by using amorphous silicon nanoantenna arrays (a-Si NA arrays) that suppress backward and forward scattering with engineered lattice resonance with Kerker effect. The overlap of electric dipole and magnetic dipole resonances is experimentally demonstrated. The absorptance of a-Si NA arrays increases 3-fold in the near-infrared (NIR) range in comparison to unpatterned silicon films. Nonradiating a-Si NA arrays can achieve high absorptance with a small resonance bandwidth (Q = 11.89) at wavelength 785 nm.

Conference Presentation

Citation Download Citation

Chi-Yin Yang, Jhen-Hong Yang, Zih-Ying Yang, Zhong-Xing Zhou, Viktoriia Babicheva, and Kuo-Ping Chen "Absorption enhancement of dielectric metasurfaces with the Kerker effect (Conference Presentation)", Proc. SPIE 10722, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XVI, 107221V (17 September 2018); https://doi.org/10.1117/12.2320406

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KEYWORDS

Dielectrics

Absorption

Amorphous silicon

Near infrared

Silicon

Nanoantennas

Photodetectors

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