Work

Active dual-band terahertz surface plasmonic wave excitation using graphene metasurfaces

Year: 2025

Type: article

Abstract: The active control of surface plasmonic waves (SPWs) through metasurfaces holds significant potential for advancing on-chip optical components. However, recent research has primarily concentrated on actively modulating the propagation and coupling of SPWs at a single frequency. Here, we propose a dual-band SPW excitation strategy in the terahertz regime using two sets of orthogonally arranged metallic slit arrays based on electromagnetically induced transparency (EIT) coupling, which enables SPW excitations at two separate frequencies under orthogonal polarization incidences. Moreover, by placing graphene ribbons on top of the arrays to adjust the damping of dark mode resonance through capacitive coupling, we numerically demonstrate an active dual-band SPWs coupler with a high modulation depth achieving 86%. Our method is universal and has application prospects in future versatile integrated photonic devices, including data interaction and frequency division multiplexing.

Source: Optics Express

DOI: 10.1364/oe.551430

Authors: Hao Su, Guanghong Xu, Quan Li, Huifang Zhang, Shuang Wang, Xueqian Zhang

Institutions: University of Electronic Science and Technology of China, Tianjin University

Language: English

Topic: Plasmonic and Surface Plasmon Research

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: Guangxi Key Laboratory of Optoelectroric Information Processing, National Natural Science Foundation of China