Hybrid Tamm and quasi-BIC microcavity modes

The microcavity in the form of a liquid crystal defect layer embedded in a one-dimensional photonic crystal is considered. The microcavity mode has a tunable radiation decay rate in the vicinity of a bound state in the continuum. It is demonstrated that coupling between the microcavity mode and a Tamm plasmon polariton results in hybrid Tamm-microcavity modes with a tunable Q factor. The measured spectral features of hybrid modes are explained in the framework of the temporal coupled mode theory. It is demonstrated that coupling between a Tamm plasmon polariton and the microcavity mode in the vicinity of a bound state in the continuum results in hybrid Tamm-microcavity modes with a tunable Q factor.