  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.
