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arXiv · 1704.08786

Momentum Analysis for Metasurfaces

Wenwei Liu·Zhancheng Li·Hua Cheng·Shuqi Chen·Jianguo Tian
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Abstract

Utilizing discrete phase distribution to fit continuous phase distribution has been a primary routine for designing metasurfaces. In the existing method, the validation of the discrete designs is guaranteed only by using the sub-wavelength condition of unit cells, which is insufficient, especially for arbitrary phase distribution. Herein, we proposed an analytical method to design metasurfaces via estimating the width of the source in a unit cell. Also, by calculating field patterns in both real- and momentum-space, we provided four guidelines to direct future applications of metasurfaces, such as an arbitrary multi-foci lens with the same strength of each focus, a convex-concave double lens, and a lens with a large numerical aperture that can precisely prevent undesired diffraction orders. Besides metalens, this methodology can provide a wide platform for designing tailored and multifunctional metasurfaces in future, especially large-area ones in practical applications.

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Wenwei Liu, Zhancheng Li, Hua Cheng, Shuqi Chen, Jianguo Tian. 2017-04-28. Momentum Analysis for Metasurfaces. https://doi.org/10.1103/physrevapplied.8.014012

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