Abstract
Abstract
Fano resonance is a pervasive phenomenon observed across many systems, which has traditionally been interpreted through the coupled harmonic oscillator model. However, the traditional model is limited, especially for different line shapes. In this study, we offer a generalized model by incorporating an imaginary coupling coefficient. This approach fundamentally differs from existing theories by identifying two unique Fano line shapes in the electric field of metallic Fabry–Perot cavity. The model connects the imaginary coupling coefficient with phase distribution of the coupling mode, thus revealing the relationship between Fano line shapes and the trend of phase shifts. This provides a new way for understanding and manipulating Fano resonance. The Fano resonance generation has been validated experimentally through reflection spectra. Our investigation offers a new perspective for understanding of Fano resonance via the coupled harmonic oscillator model and paves a way for the development of dynamically tunable Fano resonance devices.
Funder
Shanghai Municipal Science and Technology Major Project
National Natural Science Foundation of China
Chinese Academy of Sciences President‘s International Fellowship Initiative
National Key Research and Development Program of China
Subject
Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials