Work

Hyperbolic dispersion and negative refraction in a periodic perfect magnetic conductor and perfect electric conductor parallel-plate waveguide structure

Year: 2025

Type: article

Abstract: We present a numerical demonstration that a periodic structure composed of alternating perfect magnetic conductor (PMC) and perfect electric conductor (PEC) parallel-plate waveguides (PPWs), filled with dielectric materials of permittivity ɛ 1 and ɛ 2 , and separated by a gap h , exhibits hyperbolic dispersion and negative refraction. This phenomenon is enabled by surface waves confined at the PMC–PEC interfaces and disappears when the dielectric permittivities are equal ( ɛ 1 = ɛ 2 ), eliminating surface wave support. Furthermore, the hyperbolic nature of the dispersion is confirmed by simulated radiation patterns from a point dipole source embedded in the periodic structure. • We introduce a periodic PMC–PEC parallel-plate waveguide (PPW) structure that naturally exhibits hyperbolic dispersion without requiring auxiliary elements such as thin wires. • Negative refraction is numerically demonstrated and verified through photonic band structures, equi-frequency contours (EFCs), and dipole radiation patterns. • The hyperbolic response originates from PEC–PMC interface surface waves, which resemble surface plasmons but do not follow Drude-type dispersion. • Effective anisotropic parameters are numerically retrieved, confirming the hyperbolic nature of the proposed structure.

Source: Results in Physics

DOI: 10.1016/j.rinp.2025.108459

Authors: Seong-Han Kim, Chul-Sik Kee

Institution: Gwangju Institute of Science and Technology

Language: English

Topic: Metamaterials and Metasurfaces Applications

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,920

Funders: Gwangju Institute of Science and Technology, National Research Foundation of Korea