A wide-field-of-view metalens array for CMOS image sensors’ conical light focusing

Xiaoshao Ma; Qing Luo; Yang Zhou; Ruiyu Yang; Guosheng Wang; Mengqi Yao; Zungui Ke

Results in Physics (Apr 2024)

A wide-field-of-view metalens array for CMOS image sensors’ conical light focusing

Xiaoshao Ma,
Qing Luo,
Yang Zhou,
Ruiyu Yang,
Guosheng Wang,
Mengqi Yao,
Zungui Ke

Affiliations

Xiaoshao Ma: National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 610054, China; Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education, University of Electronic Science and Technology of China, Chengdu 611731, China; Corresponding authors at: National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 610054, China (X. Ma, Y. Zhou).
Qing Luo: National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 610054, China; Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education, University of Electronic Science and Technology of China, Chengdu 611731, China
Yang Zhou: National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 610054, China; Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education, University of Electronic Science and Technology of China, Chengdu 611731, China; Corresponding authors at: National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 610054, China (X. Ma, Y. Zhou).
Ruiyu Yang: Key Laboratory of Lidar and Device, Southwest Institute of Technical Physics Chengdu, China
Guosheng Wang: Key Laboratory of Lidar and Device, Southwest Institute of Technical Physics Chengdu, China
Mengqi Yao: Key Laboratory of Lidar and Device, Southwest Institute of Technical Physics Chengdu, China
Zungui Ke: Key Laboratory of Lidar and Device, Southwest Institute of Technical Physics Chengdu, China; Corresponding authors at: National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu 610054, China (X. Ma, Y. Zhou).

Journal volume & issue: Vol. 59
p. 107583

Abstract

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Microlens array combined with CMOS sensors have recently been the subject of intensive research due to their ability to significantly enhance imaging sensitivity. However, existing microlens arrays suffer from a limited field-of-view, necessitating complex lens assemblies that increase system cost, size and weight. In this study, we present a novel approach utilizing a single layer metalens array composed of low loss and high-index α-Si materials. The metalens array was designed using a phase compensation method to efficiently focus conical light with arbitrary cone angles onto the center pixels of the CMOS sensor. Theoretical analysis demonstrates that the metalens is capable of focusing ± 20° conical light with an impressive efficiency of 83.6 %, which can be extended to arbitrary cone angles. Experimental results reveal a measured focusing efficiency of 73 % under an incidence angle of ± 8.3° for conical light, representing an improvement of 8 % compared to parallel light incidence. This research presents a promising solution for wide-field-of-view metalens arrays in integrated CMOS imaging systems.

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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