Multifunctional Metamirrors Involving Simultaneous Linear-polarization Conversion and Focusing

TL;DR

This paper introduces a metasurface platform that combines linear-polarization conversion and focusing in a single ultrathin element, enabling complex optical functionalities with high efficiency across a broad wavelength range.

Contribution

The work presents a novel metasurface design that achieves simultaneous polarization conversion and wavefront control, integrating multiple optical functions into one compact device.

Findings

Demonstrated multifunctional metamirrors with polarization conversion and focusing

Achieved high efficiency within 800-950 nm wavelength range

Reproduced functionalities of lenses, wave plates, and spatial light modulators

Abstract

Reducing a set of diverse bulk-optic-based optical components to a single ultrathin and compact element that enables the same complex functionality has become an emerging research area, propelling further integration and miniaturization in photonics. In this work, we establish a versatile metasurface platform based on gap-surface plasmon meta-atoms enabling efficient linear-polarization conversion along with the complete phase control over reflected fields. Capitalizing on the meta-atom design, multifunctional metamirrors involving linear-polarization conversion and focusing are experimentally demonstrated to generate various kinds of focused beams with distinct phase distributions and wavefronts, reproducing thereby the combined functionalities of conventional half-wave plates, lenses, and even spatial light modulators. The proof-of-concept fabricated metamirrors exhibit excellent capability of linear-polarization conversion and focusing within the wavelength range from 800 to 950 nm under linearly-polarized excitation. The multifunctional metamirrors design developed in this study opens new avenues in the advanced research and applications targeting photonics integration of diversified functionalities.