Anisotropic Plasmonic Metasurfaces with Linear Polarization-Dependent Focusings

被引：1

作者：

Zhang, Heyi ^{[1
]}

Zhang, Runxuan ^{[1
]}

He, Canhui ^{[1
]}

Li, Changqing ^{[1
]}

Song, Zhengyong ^{[1
]}

机构：

[1] Xiamen Univ, Sch Elect Sci & Engn, Natl Innovat Platform Fus Ind & Educ Integrated Ci, Xiamen 361005, Peoples R China

来源：

ANNALEN DER PHYSIK | 2023年 / 535卷 / 09期

基金：

中国国家自然科学基金;

关键词：

anisotropic metasurfaces; focusing; metasurfaces; ACHROMATIC METALENS; LIGHT; BANDWIDTH; FIELD;

D O I：

10.1002/andp.202300197

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

As a burgeoning approach to modulate electromagnetic waves, metasurfaces fascinate many researchers. However, it is a persistent problem to realize independent wavefront tailoring in different polarization states. In this work, anisotropic plasmonic metasurfaces are presented with linear polarization-dependent focusings. The designed plasmonic meta-atoms consist of cross-shaped gold, silica spacer, and gold substrate. Phase modulation in different polarization channels is independently achieved by adjusting the dimensions of cross-shaped gold in x- and y-directions. Three metasurfaces are presented to verify linear polarization-dependent focusings at 200 THz. First, a focusing metasurface is designed with focal lengths of 5.2 & mu;m under x-polarized incidence and 6.5 & mu;m under y-polarized incidence. Second, by applying convolution operation, the second metasurface exhibits different focusings with different deflection angles at opposite directions under orthogonally polarized incidences. Finally, a multi-focal metasurface is demonstrated, which switches between dual- and quad-focal points depending on polarization state. The work may provide a novel platform for near-infrared integrated photonics.

引用

页数：8

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