Cascaded metasurfaces enabling adaptive aberration corrections for focus scanning

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外文摘要：Scanning focused light with corrected aberrations holds great importance in high-precision optical systems.However,conventional optical systems,relying on additional dynamical correctors to eliminate scanning aberrations,inevitably re-sult in undesired bulkiness and complexity.In this paper,we propose achieving adaptive aberration corrections coordi-nated with focus scanning by rotating only two cascaded transmissive metasurfaces.Each metasurface is carefully de-signed by searching for optimal phase-profile parameters of three coherently worked phase functions,allowing flexible control of both the longitudinal and lateral focal position to scan on any custom-designed curved surfaces.As proof-of-concept,we engineer and fabricate two all-silicon terahertz meta-devices capable of scanning the focal spot with adap-tively corrected aberrations.Experimental results demonstrate that the first one dynamically scans the focal spot on a planar surface,achieving an average scanning aberration of 1.18%within the scanning range of±30°.Meanwhile,the second meta-device scans two focal points on a planar surface and a conical surface with 2.5%and 4.6%scanning aberrations,respectively.Our work pioneers a breakthrough pathway enabling the development of high-precision yet compact optical devices across various practical domains.

外文关键词：

terahertzfocus scanningaberration correctiondielectric metasurface

作者：

Xiaotong Li、Xiaodong Cai、Chang Liu、Yeseul Kim、Trevon Badloe、Huanhuan Liu、Junsuk Rho、Shiyi Xiao

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作者单位：

Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,Shanghai Institute for Advanced Communication and Data Science,Shanghai University,Shanghai 200240,China

Department of Mechanical Engineering,Pohang University of Science and Technology(POSTECH),Pohang 37673,Republic of Korea

Graduate School of Artificial Intelligence,Pohang University of Science and Technology(POSTECH),Pohang 37673,Republic of Korea

Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China

Department of Chemical Engineering,Pohang University of Science and Technology(POSTECH),Pohang 37673,Republic of Korea

Department of Electrical Engineering,Pohang University of Science and Technology(POSTECH),Pohang 37673,Republic of Korea

POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics,Pohang 37673,Republic of Korea

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出版年：

2024

DOI：

10.29026/oea.2024.240085

光电进展(英文版)

ISSN：

年,卷(期)：2024.7(10)