Performance analysis of organic material assisted dynamically tunable excitation of optical Tamm state

The manuscript presents the tunable excitation characteristics of an optical Tamm state (OTS). The tunability is obtained by integrating a functional organic crystal DAST (4-N,N-dimethylamino-4′-N′-methyl-stilbazolium tosylate) material with conventional one-dimensional photonic crystal (1D-PhC) structure. The DAST layer is deliberately introduced at the top of the structure to excite a plasmonic-like mode called OTS. The device structure is thoroughly optimized to excite the OTS at a 632.8 nm operating wavelength. The OTS excitation is analyzed analytically by angular interrogation, wavelength interrogation methods, and electrical field distribution interrogation. The dispersion analysis exhibits a strong excitation of OTS at the top interface when a polychromatic light is incident at a 45.11° incidence angle. This demonstrates a post-fabrication 47 nm dynamic wavelength tuning of excited Tamm mode by applying a ± 5 V bias voltage. Additionally, the Tamm mode response is very stable, which requires only a 5.7° variation in incidence angle to excite the Tamm at a constant 632.8 nm operating wavelength for the corresponding bias voltage variation of ± 5 V. This shows its potential applications in tunable stable optical sensors, dynamic color filtering and displays, and short focal length tuning compact imagers. This novel integration of organic electro-optical material with 1D-PhC will enhance its applicability in future tunable optical devices.