Splitting Arbitrary Polarized Light with a Flat Dielectric Metagrating

Advanced Photonics Research

Junren Wen¹  Chenying Yang¹  Tingting Zheng²  Xiao Chen²  Yueguang Zhang²  Hao Luo²  Hailan Wang²  Weidong Shen² 

[1] Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou 310024 China;State key laboratory of Modern Optical Instrumentation Department of Optical Engineering Zhejiang University Hangzhou 310027 China;

关键词: arbitrary polarizations;    beam splitters;    broad working wavelength ranges;    flat dielectric metagrating;   

DOI  :  10.1002/adpr.202100282

来源: DOAJ

【 摘 要 】

The beam splitter is one of the basic optical components. Traditional beam splitters use bulky cubes or plates to realize beam splitting and thereby can hardly be used in a compact optical system. Recently, the beam splitter based on phase gradient metasurfaces has been proposed to split beam with a compact size. However, it is facing challenges on the efficiency and manufacturability. Herein, a beam splitter based on single‐sized flat dielectric metagrating for arbitrary polarizations is proposed. The diffraction efficiency of the fabricated beam splitter reaches as high as 80% for both TM and TE polarizations at peak wavelength. Moreover, it has a broad working wavelength range (455–550 nm) at visible wavelength where the diffraction efficiency is much higher than 60%. Apart from the broadband and high diffraction efficiency, the steering angle can be simply adjusted by varying the periodicity. Splitting light with a flat metagrating enriches the field of flat photonics, opening up new possibilities in applications such as augment reality displays, imaging systems, compact spectrometers, and lidars.

【 授权许可】

Unknown