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Analysis of coupling controlled tunable Fano resonance in metal-insulator-metal plasmonic waveguide

RUKHSAR ZAFAR1,* , YAZUSHA SHARMA2

Affiliation

  1. Department of Electronics and Communication Engineering, Swami Keshvanand Institute of Technology, Management and Gramothan, Jaipur, India
  2. Department of Electronics and Communication Engineering, Jaipur Engineering College and Research Centre, Jaipur, India

Abstract

Fano resonance features a distinct asymmetrical profile caused by the interference of two resonant modes. The two resonant modes are termed “bright” and “dark” modes. In this paper, an analytical approach based on coupled mode theory (CMT) is used to demonstrate the tunable Fano resonance by varying the coupling between both the resonant modes. The effect on group delay, related bandwidth and dispersion characteristics is also explored. The results are validated through FDTD (finite-difference in Time Domain) by exciting a Fano resonance in Plasmonic MIM (Metal-Insulator-Metal) waveguide-based end-coupled stub resonators. The finding underscores the potential of Fano resonance in tuning dispersion, group delay etc., thus, it is viable in different photonics applications like sensing, modulation, and buffering..

Keywords

Fano resonance, Coupled mode theory, FDTD, MIM waveguide.

Submitted at: Sept. 30, 2025
Accepted at: June 2, 2026

Citation

RUKHSAR ZAFAR, YAZUSHA SHARMA, Analysis of coupling controlled tunable Fano resonance in metal-insulator-metal plasmonic waveguide, Journal of Optoelectronics and Advanced Materials Vol. 28, Iss. 5-6, pp. 235-241 (2026)