# Directing nanoscale optical flows by coupling photon spin to plasmon extrinsic angular momentum

## TL;DR

This paper demonstrates how coupling photon spin to extrinsic angular momentum in curved nanoscale plasmonic waveguides enables tunable, highly directional light guiding, with up to 95% of light directed in a chosen direction, advancing subwavelength optical control.

## Contribution

It introduces a novel method to control light directionality at the nanoscale by exploiting spin-orbit interactions in curved plasmonic waveguides, achieving high unidirectionality.

## Key findings

- Up to 95% of light can be directed into one propagation direction.
- Helicity of incident light controls power distribution between modes.
- Demonstrates tunable symmetry breaking in nanoscale waveguides.

## Abstract

As any physical object, light undergoing a circular trajectory features a constant extrinsic angular momentum. Within strong curvatures, this angular momentum can match the spin momentum of a photon, thus providing the opportunity of a strong spin-orbit interaction. Using this effect, we demonstrate tunable symmetry breaking in the coupling of light in a curved nanoscale plasmonic waveguide. The helicity of the impinging optical wave controls the power distribution between the two counter-propagating guided modes, including unidirectional waveguiding. We found that up to 95 % of the incoupled light can be directed into one of the two propagation directions of the waveguide. This approach offers appealing new prospects for the development of advanced, deeply subwavelength optical functionalities.