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.
Bibliographical noteKAUST Repository Item: Exported on 2023-06-06
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering