The Magnetic Dislocation in Photonics

TL;DR

This paper introduces the concept of magnetic dislocation in topological photonic materials, enabling flexible, reconfigurable light control through magnetic domain walls, with tunable localization and edge modes.

Contribution

It proposes the magnetic dislocation concept in topological photonics, combining defect and edge mode control, and demonstrates its properties in a representative model.

Findings

Distinct localization modes and robust light trapping phenomena

Eigen-energy of trapping states can be linearly tuned by magnetic dislocation

Conversion between trapping states and edge modes via adiabatic pumping

Abstract

The dislocation created in the topological material lays the foundation of many significant findings to control light but requires delicate fabrication of the material. To extend its flexibility and reconfigurability, we propose the magnetic dislocation concept and unveil its properties in a representative model, which effectively combines the topological defect and edge mode at the magnetic domain wall. The results include distinct localization modes and robust light trapping phenomena with the rainbow feature where the eigen-energy of each light-trapping state can be linearly tuned by the magnetic dislocation. The conversion from the trapping state to edge modes can be harnessed by further adiabatically pumping light across an amount of the magnitude of the magnetic dislocation. Our work solves a fundamental problem by introducing magnetic dislocation with new light-manipulation flexibility, which may be implemented in a variety of platforms in photonic, acoustics, and optomechanics with dynamic modulations and synthetic dimensions.