Enhanced and tunable photonic spin Hall effect with optical Tamm states

Abstract

The photonic spin Hall effect has attracted considerable attention for its potential applications in precision metrology and spin-based photonics. However, the spin-dependent transverse shift arising from this phenomenon is considerably weak and poses a challenge in terms of detection. Here, we present a novel technique to amplify the photonic spin Hall effect by exciting the optical Tamm states through an Au-distributed Bragg reflector. Our approach involves optimizing the thickness of the Au layer and the spacing layer, as well as adjusting the Fermi energy of graphene. The result is a remarkable transverse shift of up to 18 μm in the horizontal polarization state. Furthermore, we introduce graphene into the Au-distributed Bragg reflector to enable dynamic control of the photonic spin Hall effect by manipulating the Fermi energy of graphene. These findings represent an innovative platform for enhancing and actively controlling the photonic spin Hall effect with significant potential for spin-controlled optics.