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Spin-Selected Dual-Wavelength Plasmonic Metalenses

1
Department of Mathematics and Physics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2
School of Computer and Information, Hefei University of Technology, Hefei 230009, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(5), 761; https://doi.org/10.3390/nano9050761
Received: 23 March 2019 / Revised: 24 April 2019 / Accepted: 10 May 2019 / Published: 17 May 2019
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Abstract

Several novel spin-selected dual-wavelength metalenses have been proposed and investigated based on the plasmonic metasurface consisting of two kinds of rotary rectangle gap nanoantennas (RGN), which are designed based on merging two or four polarity-inverse lenses corresponding to different wavelengths (765 and 1300 nm). The spin-selected dual-wavelength metalenses with two similar and two different vertical and lateral focal points have also been proposed respectively, which can focus two wavelengths with inverse spin states to arbitrary special positions. The three-dimensional metalens with four focal points have also been proposed, which can focus four beams with inverse spin states and different wavelengths to preset positions. Moreover, a spin-dependent achromatic metalens has also been proposed, which can focus left circularly polarized (LCP) incidence with different wavelengths to the same position. Our work opens up new avenues toward establishing novel spin-selected and wavelength-selected metadevices, and is significant for the development of spin-controlled photonics and particles manipulation. In addition, it provides a new idea for solving the problem of data transmission from optical fiber communication to visible light communication. View Full-Text
Keywords: metasurface; spin; phase modulation; metalens metasurface; spin; phase modulation; metalens
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Wang, W.; Zhao, Z.; Guo, C.; Guo, K.; Guo, Z. Spin-Selected Dual-Wavelength Plasmonic Metalenses. Nanomaterials 2019, 9, 761.

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