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Z. DUN1, B. LIU2, F C HEN2,*
A plasma dielectric p lasma (PDP) waveguide structure consisting of a bus waveguide, a stub cavity, and a U shaped coupling cavity is designed, and the two dime nsional finite difference time domain (FDTD) method is adopted for simulation. Transmission spectra show that the stub cavity structure corresponds to a continuous spectrum, the coupling cavity structure corresponds to a discrete state, and the coupling of the two resonators can produce a significant Fano resonance. Magnetic field distribution confirms that energy localization and destructive interference determine the transmission dips, while dual cavity coupling enhances transmission at the Fano peak. The geometric parameters of the structure (coupling cavity side length, stub cavity length, and cavity spacing) can effectively regulate the position, transmittance, and line shape of the Fano resonance. In the present work, a Fano interference model is const ructed to fit the transmission spectra, and the theoretical calculation results are in excellent consistency with the FDTD simulation results. In the frequency band of 0.3 1.3 GHz, the dielectric constant of the gaseous discharge plasma is determined by th e plasma frequency, thus enabling the PDP structure to break the limitation that traditional waveguides cannot be dynamically modulated after fabrication. Dynamic tuning of the resonance frequency and transmittance can be realized by changing the plasma el ectron density. In this work, the designed PDP structure can be prepared using electron beam lithography (EBL), focused ion beam (FIB) lithography, and nano imprinting technology. This provides a feasible solution for dynamic tunable plasma devices in the microwave frequency band..
PDP, Fano resonance, Plasma , FDTD, Nanoimprinting technology.
Z. DUN, B. LIU, F C HEN, Tunable Fano resonance based on plasma dielectric plasma waveguide coupled resonator system, Optoelectronics and Advanced Materials - Rapid Communications, 20, 7-8, July-August 2026, pp.329-337 (2026).
Submitted at: March 19, 2026
Accepted at: Aug. 3, 2026
Optoelectronics and Advanced Materials - Rapid Communications
(2025): Impact Factor = 0.5 - Journal Citation Reports (Clarivate Analytics, 2026)
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