Abstract
Fresnel zone plates consisting of multiple concentric rings have been realized by tailoring amplitude, phase and polarization of light, but conventional Fresnel zone plates require totally different materials to control each property reducing light controllability. Here, a metasurface zone plate in which rings are composed of subwavelength antenna arrays is proposed to individually control amplitude, phase and polarization by the consistent material platform of metasurfaces. Hence, versatile degrees of freedom can be achieved to focus electromagnetic waves. We verify that dielectric metasurfaces can generate arbitrary poloarization states to cover the whole Poincaré sphere in the visible regime, allowing light manipulation in the vectorial regime, which is not feasible by a conventional single liquid crystal film. Experimental demonstration of a polarization-modulated metasurface zone plate confirms the functional capability of dielectric metasurfaces exhibiting higher focusing efficiency than amplitude-modulated zone plates.
Highlights
Fresnel zone plates consisting of multiple concentric rings have been realized by tailoring amplitude, phase and polarization of light, but conventional Fresnel zone plates require totally different materials to control each property reducing light controllability
Fresnel zone plate (FZP) have been realized by tailoring wave properties such as amplitude, phase, and polarization, but conventional FZPs require totally different materials to control each property, which reduces degrees of freedom (DOF) in a functional multiplicity
We confirm that dielectric metasurfaces can generate arbitrary polarization states to cover the whole Poincaré sphere in the visible allowing light manipulation in vectorial regime, which is not feasible by the conventional single liquid crystals (LCs) film
Summary
Fresnel zone plates consisting of multiple concentric rings have been realized by tailoring amplitude, phase and polarization of light, but conventional Fresnel zone plates require totally different materials to control each property reducing light controllability. A metasurface zone plate in which rings are composed of subwavelength antenna arrays is proposed to individually control amplitude, phase and polarization by the consistent material platform of metasurfaces. We verify that dielectric metasurfaces can generate arbitrary poloarization states to cover the whole Poincaré sphere in the visible regime, allowing light manipulation in the vectorial regime, which is not feasible by a conventional single liquid crystal film. FZPs have been realized by tailoring wave properties such as amplitude, phase, and polarization, but conventional FZPs require totally different materials to control each property, which reduces degrees of freedom (DOF) in a functional multiplicity. We confirm that dielectric metasurfaces can generate arbitrary polarization states to cover the whole Poincaré sphere in the visible allowing light manipulation in vectorial regime, which is not feasible by the conventional single LC film. Since metasurface-based rings of MZPs can provide more DOF to fit one’s demand compared with simple thin film-based rings, which limit the functionality of FZPs, MZPs can find applications of multifunctional light-focusing devices replacing conventional thin film-based FZPs
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