Chiral Surface Wave propagation with Anomalous Spin-momentum Locking
Abstract
The ability to control the directionality of surface waves by manipulating its polarization has been of great significance for applications in spintronics and polarization-based optics. Surface waves with evanescent tails are found to possess an inherent in-plane transverse spin which is dependent on the propagation direction while an out-of-plane transverse spin does not naturally occur for surface waves and requires a specific surface design. Here, we introduce a new type of surface waves called chiral surface wave which has two transverse spins, an in-plane one that is inherent to any surface wave and an out-of-plane spin which is enforced by the design due to strong x-to-y coupling and broken rotational symmetry. The two transverse spins are locked to the momentum. Our study opens a new direction for metasurface designs with enhanced and controlled spin-orbit interaction by adding an extra degree of freedom to control the propagation direction as well as the transverse spin of surface waves.
Cite
@article{arxiv.2109.10314,
title = {Chiral Surface Wave propagation with Anomalous Spin-momentum Locking},
author = {Sara M. Kandil and Dia'aaldin J. Bisharat and Daniel F. Sievenpiper},
journal= {arXiv preprint arXiv:2109.10314},
year = {2021}
}