Metasurface for Structured Light Projection over 120° Field of View

被引：116

作者：

Ni, Yibo ^{[1
]}

Chen, Sai ^{[1
]}

Wang, Yujie ^{[2
]}

Tan, Qiaofeng ^{[1
]}

Xiao, Shumin ^{[2
]}

Yang, Yuanmu ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Precis Instrument, State Key Lab Precis Measurement Technol & Instru, Beijing 100084, Peoples R China

[2] Harbin Inst Technol, Shenzhen Grad Sch, State Key Lab Tunable Laser Technol, Minist Ind & Informat Technol,Key Lab Micronano O, Shenzhen 518055, Peoples R China

来源：

NANO LETTERS | 2020年 / 20卷 / 09期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Metasurface; Dielectric antenna; Structured light projection; Depth perception; BROAD-BAND; FLAT OPTICS; PHASE; POLARIZATION; ELEMENTS; DESIGN;

D O I：

10.1021/acs.nanolett.0c02586

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Structured light projection is a widely adopted approach for depth perception in consumer electronics and other machine vision systems. Diffractive optical element (DOE) is a key component for structured light projection that redistributes a collimated laser beam to a spot array with uniform intensity. Conventional DOEs for laser spot projection are binary-phase gratings, suffering from low efficiency and low uniformity when designed for a large field of view (FOV). Here, by combining vectorial electromagnetic simulation and interior-point method for optimization, we experimentally demonstrate polarization-independent silicon-based metasurfaces that can project a collimated laser beam to a spot array in the far-field with an exceedingly large FOV over 120 degrees x 120 degrees. The metasurface DOE with large FOV may benefit a number of depth perception-related applications such as face-unlock and motion sensing.

引用

页码：6719 / 6724

页数：6

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