Thickness bound for nonlocal wide-field-of-view metalenses
作者机构：Ming Hsieh Department of Electrical and Computer EngineeringUniversity of Southern CaliforniaLos AngelesCA 90089USA
出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)
年 卷 期：2022年第11卷第12期
页 面：3018-3027页
核心收录：
学科分类：07[理学] 0701[理学-数学] 0702[理学-物理学] 070101[理学-基础数学]
基 金：supported by the National Science Foundation CAREER award(ECCS-2146021) the Sony Research Award Program
摘 要：Metalenses—flat lenses made with optical metasurfaces—promise to enable thinner,cheaper,and better imaging *** a sufficient angular field of view(FOV)is crucial toward that goal and requires a tailored incidentangle-dependent ***,we show that there is an intrinsic trade-off between achieving a desired broad-angle response and reducing the thickness of the *** the memory effect in disordered media,this thickness bound originates from the Fourier transform duality between space and *** can write down the transmission matrix describing the desired angle-dependent response,convert it to the spatial basis where its degree of nonlocality can be quantified through a lateral spreading,and determine the minimal device thickness based on such a required lateral *** approach is *** applied to wide-FOV lenses,it predicts the minimal thickness as a function of the FOV,lens diameter,and numerical *** bound is tight,as some inverse-designed multi-layer metasurfaces can approach the minimal thickness we *** work offers guidance for the design of nonlocal metasurfaces,proposes a new framework for establishing bounds,and reveals the relation between angular diversity and spatial footprint in multi-channel systems.
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