Issue 3, 2023

Slow-light effects based on the tunable Fano resonance in a Tamm state coupled graphene surface plasmon system

Abstract

We theoretically realize the tunable Fano resonance in a hybrid structure that allows the coupling between Tamm plasmon-polaritons (TPPs) and graphene surface plasmon-polaritons (SPPs). In this coupling system, a distributed Bragg reflector (DBR)/Ag structure is designed to generate the TPP with a narrow resonance, and the graphene SPP is excited by grating coupling with a broad resonance. The overlap of these two kinds of resonances results in the Fano resonance with a high-quality factor close to 1500. The behaviors of the Fano resonance are discussed carefully, and the results show that both the graphene Fermi level and the incidence angle can actively tune the profile of the Fano resonance. Owing to the ultrasharp spectrum of the tunable Fano resonance, our design may offer an alternative strategy for developing various optoelectronic devices such as filters, sensors, and nonlinear and slow-light devices. Finally, as an example of the potential applications, we apply the tunable Fano resonance to the slow-light effect, a high performance slow-light effect can be achieved, and the group delay can reach up to 52 ps.

Graphical abstract: Slow-light effects based on the tunable Fano resonance in a Tamm state coupled graphene surface plasmon system

Article information

Article type
Paper
Submitted
28 Sep 2022
Accepted
06 Dec 2022
First published
10 Dec 2022

Phys. Chem. Chem. Phys., 2023,25, 1685-1689

Slow-light effects based on the tunable Fano resonance in a Tamm state coupled graphene surface plasmon system

B. Ruan, M. Li, C. Liu, E. Gao, Z. Zhang, X. Chang, B. Zhang and H. Li, Phys. Chem. Chem. Phys., 2023, 25, 1685 DOI: 10.1039/D2CP04531A

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