Theoretical design of manipulating the number of photonic spin Hall effect channels with Tamm plasmon polariton and its sensing capabilities.

In this paper, the induction effect of Tamm plasmon polariton (TPP) mode on photonic spin Hall effect (PSHE) is discovered. As the incident angle increases, the TPP mode exhibits a polarization separation effect, which is conducive to the emergence of PSHE. PSHE is excited near the absorption frequencies of both the TM and TE waves, with displacement dominating the TM wave and displacement dominating the TE wave. The number of TPP channels is usually half that of PSHE, which enables quantitative control over the number of PSHE. In addition, the obtained PSHE has more potential as a sensor. On the one hand, compared with the TPP absorption peak, the PSHE peak is narrower, making a ten-fold increase in resolution. Different channels of PSHE can be used to detect different refractive index (RI) ranges, thus expanding the linear range. Moreover, analyzing PSHE displacement helps capture subtle RI changes, which is beneficial to the detection of gases, while the TPP peak fails to possess this ability.