Abstract
In view of wide applications of vector light with a non-uniform polarization state, a compound vector light generator is proposed to generate compound vector light. One compound vector light contains two or more non-uniform polarization modes and several annular intensities, which can carry more polarization information and possess higher dimensional singularity. The proposed compound vector light generator consists of cross nanoholes with high polarization conversion efficiency; it works under linear polarized light, and the mode of the generated compound vector light can be adjusted through rotating cross nanoholes. The structure parameters of the compound vector light generator are optimized with the aid of numerical simulation, and the simulation results for the generated light fields verify the performance of the proposed device. The advancement of the compound vector light and metasurface design of the compound vector light generator can assist in the exploration of novel singular properties of light fields and the broadening of applications of vector light fields.
Highlights
Polarization is one of the most important natural properties of light, and the familiar polarization states of light include spatial uniform linear and circular polarization
We propose the model of compound vector lights (CVLs) and design the compound vector light generator (CVLG) based on a metasurface, which can generate the CVL with two or more spatially non-uniform polarization modes
The designed CVLG consists of two sets of nanometer cross nanoholes etched on silver film, which are distributed in different radial regions
Summary
Polarization is one of the most important natural properties of light, and the familiar polarization states of light include spatial uniform linear and circular polarization. Zhang et al designed a polarization multiplexing metasurface consisting of nanoholes and generated radially and azimuthally polarized vector beams at the nanoscale under two orthogonal linearly polarized light illuminations [22]. Teng et al proposed a uniform theory for the generation of vector beams, with the help of the base transformation [25] All these studies refer only to the generation of vector beams with a single polarization mode. Compound vector lights (CVLs) with multiple polarization modes distributed in different regions, like the double-ring vector beam [26,27,28], have been rarely studied using the metasurface. We propose the model of CVL and design the compound vector light generator (CVLG) based on a metasurface, which can generate the CVL with two or more spatially non-uniform polarization modes. The generated compound vector beams have the advantage of parallel output, and they can provide more possibilities for the applications of vector lights in optical communication and optical micro-manipulation
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