光学
极化(电化学)
计算
物理
计算机科学
算法
物理化学
化学
作者
Yongliang Liu,Wenwei liu,Lei Zhu,Yifei Xu,Bo Yu,Zhancheng Li,Hua Cheng,Shuqi Chen
出处
期刊:Optics Letters
[The Optical Society]
日期:2024-08-15
卷期号:49 (17): 4926-4926
摘要
In recent years, due to the increasing requirement for real-time and massive data processing, optical analog computation has arisen as a promising alternative to digital computation. Optical spatial differentiation plays a fundamentally important role in various emerging technologies, including augmented reality, autonomous driving, and object recognition. However, previous demonstrations encountered several limitations, such as the dependence on polarization states and a typically limited numerical aperture (NA) of about 0.5, especially in the transmission mode. Here, a new, to our knowledge, design strategy based on the evolution between impedance matching and mismatching in a metasurface is proposed to fill this gap, which can perform dual-polarized second-order derivative for image processing. Our scheme enables high transmission under dual polarization over an 85° incident angle range (NA = 0.996), resulting in more than twofold spatial resolution. Our work paves the way for polarization-insensitive high-resolution signal and image processing in the terahertz region.
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