基于几何相位的超表面产生涡旋光束的研究进展
A review of generation of vortex beams based on the geometric phase metasurfaces
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摘要: 基于几何相位原理,对近年来使用超表面(等离子体超表面、全介质超表面、金属间隙型超表面、多功能超表面)产生涡旋光束的研究现状进行综述,指出:基于几何相位的超表面设计简单,产生的涡旋光束无色散,在近红外波段,具有等离子体超表面加工简单、频段宽,全介质超表面透过率高等特点;在中红外波段,具有金属间隙型超表面反射率高、无色差等特点;多功能超表面可以用于轨道角动量的复用和解复用,同时产生矢量、标量涡旋光束等功能.随着微纳加工技术的不断成熟,未来超表面将会向着低损耗、宽频段、可调控、多功能等方向发展,并进一步拓展其在集成光学领域的应用.Abstract: Based on the principle of geometric phase,the relevant research of generating vortex beam by metasurfaces (the plasmonic metasurfaces,the all-dielectric metasurfaces,the Gap-plasmon metasurfaces and the multi-function metasurfaces) was reviewed in recent years.It was pointed out that the metasurfaces based on the geometric phase had the characteristics of simple design and dispersion-free of vortex beam.In the near-infrared band,the plasmonic metasurfaces had the characteristics of easy fabrication and broadband,the all-dielectric metasurfaces had the characteristic of high transmittance.In the mid-infrared band,the Gap plasmon metasurfaces had the characteristics of high reflectance and aberration-free.The multi-function metasurfaces were capable of generating vector and scalar vortex beams simultaneously.With the maturity of nanofabrication technology,in the future,metasurfaces will develop in the direction of low loss,broadband,adjustability,multi-function and so on,and the advanced nano-fabrication technology will enable metasurfaces available for integrated optical system.
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Key words:
- geometric phase /
- metasurfaces /
- vortex beam
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