Magneto-optical effects on the properties of the photonic spin Hall effect owing to the defect mode in photonic crystals with plasma

Y L Liu,B Guo,W C Chen

doi:10.1063/1.5094664

Abstract

In this study, we have demonstrated a multi-layered structure to examine how the magneto-optical effects affect the behavior of the photonic spin Hall effect (PSHE). The Faraday and Voigt effects are taken into account. The multi-layered structure is one-dimensional (1D) photonic crystal (PC) with a defective plasma layer. The properties of the PSHE in both symmetric and asymmetric defective PCs are explored. The numerical results show that the applied magnetic field and the geometries of the structures have significantly changed the characteristics of the PSHE. The transverse displacements of the H-polarization can be easily enhanced by more than ten times, while the transverse displacement of the V-polarization can be easily suppressed by a few percent based the manipulating of the external magnetic field. Moreover, the magneto-optical effects can change the optimal incident angle for the assessment of the peak transverse displacements of the PSHE. In addition, the numerical results also show that the plasma frequency, defective plasma thickness, and the geometry of the structure have greatly influenced the behavior of the PSHE. The parameter dependencies of theses effects are also calculated and discussed.

Highlights

The study of the interplay of electromagnetic waves with plasma has developed into one of the most rapidly growing fields of plasma physics during the last decade
The transverse displacements for both the horizontal and vertical polarizations are normalized to the designed wavelength of the incident light λ0
The multi-layered structure was engineered in the forms of symmetric and asymmetric defective photonic crystal (PC)

Summary

Introduction

The study of the interplay of electromagnetic waves with plasma has developed into one of the most rapidly growing fields of plasma physics during the last decade. Researchers find that there is a transverse splitting of left- and right-handed circularly polarized components when a linearly polarized light passes through an interface with a refractive index gradient. This interesting transport phenomenon was first proposed by Onoda et al. and it is referred to as the photonic spin Hall effect (PSHE) of light. It was concluded that the scitation.org/journal/adv magnitudes of the transverse displacements mainly depended on the ratio |rs|/|rp| or |rp|/|rs| when other quantities were constant for a specific incident angle (rs and rp are the Fresnel reflection coefficients for s- and p-waves, respectively). The effects of the plasma frequency, defective layer thickness, and the geometry of the structure are examined and discussed in detailed

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Conclusion