Orbital Angular Momentum Generation and Detection by Geometric-Phase Based Metasurfaces

TL;DR

This paper reviews how geometric-phase metasurfaces are used to generate and detect orbital angular momentum in electromagnetic waves, offering a compact alternative to bulk optical devices by manipulating phase through polarization-dependent geometric phase.

Contribution

It provides a comprehensive overview of the design principles and applications of geometric-phase metasurfaces for OAM manipulation, highlighting their advantages over traditional bulk devices.

Findings

Metasurfaces enable efficient OAM generation and detection.

Geometric phase allows polarization-dependent phase control.

Metasurfaces reduce device size compared to bulk optics.

Abstract

We present a comprehensive review on the geometric-phase based metasurfaces for orbital angular momentum(OAM) generation and detection. These metasurfaces manipulate the electromagnetic (EM) wave by introducing abrupt phase change, which is strongly dependent on the polarization state of incident EM wave and can be interpreted by geometric phase. Hence, the conventional bulk devices that based on the accumulated phase change along the optical path can be avoided.