Enhanced spin Hall effect of reflected light due to optical Tamm states with Dirac semimetal at the terahertz range

In this work, the enhanced photonic spin Hall effect (PSHE) of reflected light at terahertz range is achieved by using a multilayer structure consisting Dirac semimetal, spacer layer, and distributed Bragg reflector structure. This PSHE phenomenon originates from excitation optical Tamm states (OTSs) interface between semimetal The theoretical results show that optimizing Fermi energy thickness reflection coefficient ratio s-polarization to p-polarization can be increased, thus creating conditions for PSHE. Moreover, behavior composite also proved sensitive incidence angle dispersion characteristics making configuration an effective candidate developing devices based on range.