典型文献
Arbitrary large-gradient wavefront shaping:from local phase modulation to nonlocal diffraction engineering
文献摘要：
The powerful wavefront manipulation capability of metasurfaces originates from their subwavelength or deep subwavelength elements with designable optical responses,especially phase responses.However,they usually suffer from performance degradation as the spatial phase gradient is large.To solve this issue,we propose an accurate and efficient nonlocal diffraction engineering mechanism to tailor an arbitrary large-gradient wavefront utilizing superwavelength-scale elements.The fast-varying phase profile is cut into segments according to 2πzones rather than subwavelength discretization.Each phase segment is accurately implemented by precisely tai-loring the diffraction pattern of the element,where diffraction angles,efficiencies,and phases are controlled simultaneously.As proof of the concept,high numerical aperture cylindrical metalenses are designed using this method and experimentally validated at the terahertz band.The cylindrical metalens is further extended to a full-space metalens,which enables high-quality subwavelength imaging with resolved details of 0.65λ.The proposed mechanism offers an efficient way to capture the fast-varying wavefront using relatively coarse geometries with new physical insights.
文献关键词：
中图分类号：
作者姓名：
XIPU DONG;JIERONG CHENG;YIWU YUAN;ZHENYU XING;FEI FAN;XIANGHUI WANG;SHENGJIANG CHANG
作者机构：
Institute of Modern Optics,Nankai University,Tianjin 300350,China;Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology,Tianjin 300350,China;Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,Tianjin 300350,China
文献出处：
引用格式：
[1]XIPU DONG;JIERONG CHENG;YIWU YUAN;ZHENYU XING;FEI FAN;XIANGHUI WANG;SHENGJIANG CHANG-.Arbitrary large-gradient wavefront shaping:from local phase modulation to nonlocal diffraction engineering)[J].光子学研究（英文）,2022(04):896-904
A类：
superwavelength
B类：
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AB值：
0.599278
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