Tamm plasmon polaritons induced active terahertz ultra-narrowband absorbing with MoS2

Tamm cavity resonant properties and singular phase behaviors of the one-dimensional photonic crystal stacked system with doped MoS2 have been comprehensively studied. Active multichannel terahertz ultra-narrowband wave absorption originated from the coupling effect of Tamm plasmon polaritons and Fabry-Perot modes. To reveal the critical absorption criterion, absorption amplitude changes in the same coupling mode order are discussed. We specifically discovered that this system has a pair of phase singularities (i.e., points of maximum absorptivity) corresponding to opposite abrupt phase transitions. It means an additional monitoring indicator used for high-sensitive label-free detection of media that outperforms metasurface absorption systems with one singularity is valuable, and no etching is required. More importantly, the phase transition phenomenon can be switched by electric-driven MoS2 via changing conductivity. These results demonstrated the proposed structure is suitable for potential terahertz applications including multifunctional phase-sensitive detectors and high-performance sensors.