Collimated flat-top beam shaper metasurface doublet based on the complex-amplitude constraint Gerchberg–Saxton algorithm-Reference-Cited by-同舟云学术

Collimated flat-top beam shaper metasurface doublet based on the complex-amplitude constraint Gerchberg–Saxton algorithm

Published:2024-01-11 Issue:0 Volume:0 Page:
ISSN:2192-8606
Container-title:Nanophotonics
language:en
Short-container-title:

Author:

Xue Dongbai¹²³⁴⁵,Dun Xiong¹²³⁴⁵,Wei Zeyong¹²³⁴⁵,Li DongDong¹²³⁴⁵,Zhu Jingyuan¹²³⁴⁵,Zhang Zhanyi¹²³⁴⁵,Wang Zhanshan¹²³⁴⁵,Cheng Xinbin¹²³⁴⁵^ORCID

Affiliation:

1. Institute of Precision Optical Engineering, School of Physics Science and Engineering , Tongji University , Shanghai 200092 , China

2. MOE Key Laboratory of Advanced Micro-Structured Materials , Shanghai 200092 , China

3. Shanghai Frontiers Science Center of Digital Optics , Shanghai 200092 , China

4. Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications , Shanghai 200092 , China

5. Shanghai Institute of Intelligent Science and Technology , Tongji University , Shanghai 200092 , China

Abstract

Abstract Collimated flat-top beam shapers primarily consisting of freeform lenses have a wide range of applications and pose challenges in terms of processing and integration when the diameter is less than millimeters. Metasurfaces represent a promising solution to planarize optics, can mimic any surface curvature without additional fabrication difficulty, and are suitable for flat-top optics. The conventional metasurface design approach relies on imparting the required phase using meta-atoms and encounters challenges in amplitude modulation due to near-field coupling and varying transmittances among meta-atoms with different phases, making the design of flat-top beam shapers difficult. In this paper, we propose a complex-amplitude constraint Gerchberg–Saxton algorithm for designing a collimated flat-top beam shaper metasurface doublet, which avoids the influence of strong near-field coupling on the amplitude distribution and simultaneously considers the amplitude-phase characteristics of the meta-atoms. A collimated flat-top beam with exceptional homogeneity U p of approximately 0.01, a wavefront error less than 0.1λ, and a transmittance higher than 86 % is experimentally obtained, comparable to commercial products based on freeform lenses. A collimated flat-top beam shaper metasurface doublet for generating flat-top beam is introduced, promoting efficient integration with laser systems.

Funder

The Special Development Funds for Major Projects of Shanghai Zhangjiang National Independent Innovation Demonstration Zone

National Natural Science Foundation of China

Shanghai Municipal Science and Technology Major Project

Science and Technology Commission of Shanghai Municipality

Publisher

Walter de Gruyter GmbH

Subject

Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology

Link

https://www.degruyter.com/document/doi/10.1515/nanoph-2023-0719/pdf

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