Tunable optical bistability in grapheme Tamm plasmon/Bragg reflector hybrid structure at terahertz frequencies

TL;DR

This paper presents a novel multilayer structure combining graphene Tamm plasmon and Bragg reflector with a defect layer to achieve low-threshold, tunable optical bistability at terahertz frequencies, enabling advanced nonlinear optical devices.

Contribution

It introduces a new composite structure that significantly reduces the switching threshold for optical bistability by coupling Tamm plasmon and defect modes.

Findings

Lowered switch-up and switch-down thresholds due to TP and DM coupling

Further reduction of thresholds by optimizing TP and DM interaction

Potential for low-threshold, tunable nonlinear optical devices

Abstract

We propose a composite multilayer structure consist of graphene Tamm plasmon and Bragg reflector with defect layer to realize the low threshold and tunable optical bistability (OB) at the terahertz frequencies. This low-threshold OB originates from the couple of the Tamm plasmon (TP) and the defect mode (DM). We discuss the influence of graphene and the DM on the hysteretic response of the TM-polarized reflected light. It is found that the switch-up and switch-down threshold required to observe the optical bistable behavior are lowered markedly due to the excitation of the TP and DM. Besides, the switching threshold value can be further reduced by coupling the TP and DM. We believe these results will provide a new avenue for realizing the low threshold and tunable optical bistable devices and other nonlinear optical devices.