Work

Nonlocal dispersion of anisotropic MIM plasmonic waveguides within the GNOR framework

Year: 2025

Type: article

Abstract: The dispersion relation of an anisotropic metal–insulator–metal (MIM) plasmonic waveguide is derived within the framework of the generalized nonlocal optical response (GNOR) model. The GNOR model extends the hydrodynamic Drude model (HDM) by introducing an electron diffusion term, thereby providing a more accurate description of nonlocal electron dynamics in metals. Numerical results indicate that increasing the diffusion constant d enhances nonlocal effects, leading to a blue shift of the modal frequency and a reduction in the propagation length. The anisotropic parameters further exert a pronounced influence on the dispersion characteristics, where variations in the principal-axis rotation angle and anisotropy ratio modify both the modal frequency and propagation behavior. These findings elucidate the coupled influence of nonlocality and anisotropy on plasmonic waveguide performance and provide theoretical guidance for the design of tunable plasmonic devices.

Source: Optics Communications

DOI: 10.1016/j.optcom.2025.132748

Authors: Wenkang Wang, Henglei Du, Chengpu Liu

Institutions: Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, University of Chinese Academy of Sciences

Language: English

Topic: Plasmonic and Surface Plasmon Research

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,600

Funder: National Natural Science Foundation of China