Angle multifunctional dichroism in metasurfaces

TL;DR

This paper introduces metasurfaces with angle-dependent polarization dichroism, achieving high efficiency and extinction ratios, enabling advanced multi-functional optical devices with angle-specific polarization control.

Contribution

The work presents novel topology-optimized metasurface designs that achieve angle-dependent polarization selectivity with high efficiency and experimentally validated performance.

Findings

Achieved over 95% transmission efficiency in simulations.

Demonstrated 50x extinction ratio in simulations.

Experimental results show 90% transmission and 10x extinction ratio.

Abstract

We demonstrate metasurfaces with strong polarization dichroism that depends on the angle of incidence. We present original designs obtained through topology optimization that selectively transmit specific linear or circular polarizations at different incident angles, while the orthogonal polarization transmission is suppressed. The designed metasurfaces exceed 95% transmission efficiency and 50x extinction ratio within the target angle ranges. The experimental characterization of fabricated metasurfaces confirms the desired operation with 90% transmission efficiency and 10x extinction ratio. These results provide important insights to non-local and k-space engineering of metasurface response and results reveal new opportunities for future multi-functional and angle-selective polarization devices that can find applications in specialized optical instruments and end-user devices.