Spin-locking metasurface for surface plasmon routing

TL;DR

This paper introduces a spin-locking metasurface that uses mirror symmetry and polarization to control and route surface plasmons efficiently, leveraging the intrinsic transverse spin angular momentum of plasmonic waves.

Contribution

It presents a novel metasurface design that achieves spin-dependent routing of surface plasmons by combining polarization, symmetry, and momentum matching techniques.

Findings

Efficient coupling of circularly polarized light to specific plasmonic directions.

Successful demonstration of spin-locking in plasmon routing.

Enhanced control over surface plasmon propagation using metasurface design.

Abstract

The spin-dependent routing of surface plasmons on metal by use of mirror symmetric periodic metasurface is presented and analyzed. We incorporate the intrinsic transverse spin angular momentum of the plasmonic wave in order to efficiently couple the incident light carrying circular polarization to a desired direction. The combination of the oblique incidence of polarized light with the accurately designed momentum matching properties of the grating provides a perfect way to achieve a spin-locking metasurface that routes the plasmonic beams.