Tunable coupled states of a pair of Tamm plasmon polaritons and a microcavity mode

Abstract

The coupled states of a pair of Tamm plasmon polaritons and a microcavity mode are studied through the transfer matrix method in a metal–Bragg reflectors–cavity–Bragg reflectors–metal configuration. The properties of coupled states can be adjusted through the cavity thickness, but there is one coupled state for which the frequency remains the same as for the uncoupled Tamm plasmon polariton and independent of the cavity thickness. When the frequency of the uncoupled cavity mode is equal to that of the bare Tamm plasmon polariton, an anticrossing behavior with the most intense coupling occurs. There are three coupled modes with antisymmetry coupling and symmetry coupling in the anticrossing region. As cavity thickness increases, two coupled modes are degenerated into one state with frequency equal to that of the bare Tamm plasmon polariton. The third lower coupled mode and the uncoupled cavity mode are merged into one frequency by steps, but a huge amplification of field occurs in the cavity with the coupled mode. An analytical description is in good agreement with the numerical results.