The interaction between optical tamm state and microcavity mode in a planar hybrid plasmonic-photonic structure

Abstract

We have studied the mode hybridization between the optical Tamm state and a microcavity mode in a planar hybrid plasmonic-photonic crystal structure. The optical Tamm state appears as an allowed mode within the photonic stop gap of the photonic crystal structure. Unlike the conventional microcavity mode which localizes its energy inside the structure, the Tamm mode localizes its optical energy at the interface between the plasmonic layer and photonic crystal structure. The strong coupling between the Tamm and microcavity mode is achieved through evoking the Tamm mode dependence of the top layer thickness of the hybrid structure. The Tamm and microcavity mode exhibit an avoided crossing characteristics in the strong coupling regime with a Rabi splitting of 4.3 meV. The electric field intensity is calculated to confirm the indistinguishability of individual modes in the exact coupling regime. The electric field intensity is spatially localized both at the interface and deep within the photonic crystal structure. The structural parameters that would influence the strong coupling between the modes are also discussed.