Broadband wavelength demultiplexer using Fano-resonant metasurface

Nanophotonics

article

Sang-Eun Mun¹  Chulsoo Choi¹  Jongwoo Hong¹  Byoungho Lee¹ 

[1] School of Electrical and Computer Engineering and Inter-University Semiconductor Research Center, Seoul National University

关键词: Fano resonance;    metasurface;    optical demultiplexer;    wavelength selective;    beam deflection;   

DOI  :  10.1515/nanoph-2019-0492

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Fano resonance, one of the interesting resonance phenomena in physics, provides versatile applications when combined with a concept of metasurface in nanophotonics. Fano-resonant metasurface (FRM) is attracting a lot of attention due to its superior narrowband characteristics as well as design freedom of metasurfaces in nanoscale. However, only the control of apparent asymmetric spectral nature of Fano resonance has been focused at applications such as optical sensors, as the amplitude feature of Fano resonances is relatively easy to control and can be measured by an experimental setup. Here, a method for modulating the phase information of FRM by both simulation and experiment is demonstrated. As a proof of concept, an optical demultiplexer, which can divide four target wavelengths in different directions of free space, is verified experimentally. It covers a broadband wavelength range of more than 350 nm in the near-infrared region with extremely small full-width at half-maximum. This approach can offer the complete control of FRM for a wide range of applications, including optical multiplexers, routers, filters, and switches, beyond conventional applications that have been limited to the amplitude control of Fano resonance.

【 授权许可】

CC BY