Unidirectional propagation of the Bloch surface wave excited by the spinning magnetic dipole in two-dimensional photonic crystal slab

Li-Ming Zhao,Yun-Song Zhou

doi:10.1038/s41598-021-98056-y

Li-Ming Zhao, Yun-Song Zhou

Open Access

https://doi.org/10.1038/s41598-021-98056-y

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Journal: Scientific Reports	Publication Date: Sep 16, 2021
Citations: 3	License type: open-access

Affiliation: Capital Normal University

Abstract

The photonic spin Hall effect (PSHE) can be realized in a photonic crystal (PC) slab, that is, the unidirectional Bloch surface wave can propagate along the surface of the PC slab under the excitation of elliptical polarized magnetic dipole. It is further proved that PSHE is caused by the interference of the component surface waves excited by the different components of the incident light, which is the so called component wave interference (CWI) theory. In addition, we also find that the spin of the surface wave oscillates periodically in space, and the oscillation period is a unit cell. In a unit cell, the average spin keeps the spin orbit locked. The results show that the spin separation can also be modulated by the position and the polarization state of the magnetic dipole.

Highlights

OPEN Unidirectional propagation of the Bloch surface wave excited by the spinning magnetic dipole in two‐dimensional photonic crystal slab
The photonic spin Hall effect (PSHE) can be realized in a photonic crystal (PC) slab, that is, the unidirectional Bloch surface wave can propagate along the surface of the PC slab under the excitation of elliptical polarized magnetic dipole
Based on the above works, we use a magnetic dipole source instead of the scatterer as a general theoretical model to study theoretically the following two issues: Whether the mechanism of generating PSHE by Bloch surface waves is similar to that of surface plasmon polariton (SPP)? Can the spin orbit locking always be satisfied? It is found that the asymmetric scattering of PSHE of the Bloch surface wave results from the component wave interference (CWI) theory, which is affected by the polarization and the position of the magnetic dipole

Summary

Introduction

OPEN Unidirectional propagation of the Bloch surface wave excited by the spinning magnetic dipole in two‐dimensional photonic crystal slab The photonic spin Hall effect (PSHE) can be realized in a photonic crystal (PC) slab, that is, the unidirectional Bloch surface wave can propagate along the surface of the PC slab under the excitation of elliptical polarized magnetic dipole.

Results

Conclusion