光子学
螺旋(铁路)
光学
相(物质)
各向同性
傅里叶变换
材料科学
物理
数学
量子力学
数学分析
作者
Pengcheng Huo,Cheng Zhang,Wenqi Zhu,Mingze Liu,Song Zhang,Si Zhang,Lu Chen,Henri J. Lezec,Amit Agrawal,Yanqing Lu,Ting Xu
出处
期刊:Nano Letters
[American Chemical Society]
日期:2020-03-10
卷期号:20 (4): 2791-2798
被引量:249
标识
DOI:10.1021/acs.nanolett.0c00471
摘要
As the two most representative operation modes in an optical imaging system, bright-field imaging and phase contrast imaging can extract different morphological information on an object. Developing a miniature and low-cost system capable of switching between these two imaging modes is thus very attractive for a number of applications, such as biomedical imaging. Here, we propose and demonstrate that a Fourier transform setup incorporating an all-dielectric metasurface can perform a two-dimensional spatial differentiation operation and thus achieve isotropic edge detection. In addition, the metasurface can provide two spin-dependent, uncorrelated phase profiles across the entire visible spectrum. Therefore, based on the spin-state of incident light, the system can be used for either diffraction-limited bright-field imaging or isotropic edge-enhanced phase contrast imaging. Combined with the advantages of planar architecture and ultrathin thickness of the metasurface, we envision this approach may open new vistas in the very interdisciplinary field of imaging and microscopy.
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