C-shaped chiral waveguide for spin-dependent unidirectional propagation
Abstract
Spin-dependent unidirectional propagation is one of the most intriguing features of the Quantum spin-Hall effect, which was studied intensively in electronic systems and led to the discovery of topological insulators. Recently, it was proven that evanescent waves intrinsically possess transverse spin that is dependent on the direction of propagation. This has enabled new applications in unidirectional waveguiding and integrated quantum optics. In this work, we study via numerical simulations a waveguide design consisting of C-shaped metallic particles characterized by extrinsic chirality and strong transverse spin. The design supports confined, spin-dependent unidirectional propagation with a high directionality ratio reaching 95%. We also study the effect of placing different local defects on the directionality of the supported guided mode.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 08, 2021
- Source ID
- 10.1063/5.0042583
Entities
People
- Daniel F. Sievenpiper
- Sara M. Kandil
Organizations
- Air Force Office of Scientific Research
- University of California, San Diego