期刊
OPTICS LETTERS
卷 45, 期 2, 页码 463-466出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.381105
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资金
- National Basic Research Program of China (973 Program) [2017YFA0701005]
- National Natural Science Foundation of China [61871268, 51402186, 11674215, 51971128]
- Natural Science Foundation of Shanghai [18ZR1425600]
- Shang hai Pujiang Program [18PJD033]
- Shuguang Program of Shanghai Education Commission [19SG44]
Metasurfaces have shown unprecedented capabilities in the manipulation of the light's wavefront at subwavelength scale, enabling compact functional devices that can outperform conventional bulk components. A device with multiple functionalities is a continuing trend of device miniaturization and system integration. Here, we propose an approach to design a helicity-dependent multi-foci metalens that can independently generate longitudinally (or transversely) multiple focal points under the illumination of left-hand. and right-hand circularly polarized terahertz waves. When this metalens is illuminated with linearly polarized terahertz waves, all of the helicity-dependent multiple focal points are observed simultaneously, leading to the multiplexing of helicity-dependent multiple focal spots. A dielectric metasurface consisting of micropillars with different in-plane orientations is utilized to demonstrate these characteristics. This approach for achieving a helicity multiplexed terahertz multi-foci metalens may open an avenue for designing future multifunctional devices. (C) 2020 Optical Society of America
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