Optical responses of Fano resonators in non-spectral parametric domains

TL;DR

This paper develops an analytical model for Fano resonances in non-spectral parametric domains, enabling better design of nanoresonators for monochromatic applications without relying solely on spectral data.

Contribution

It introduces a coupled harmonic oscillator-based analytical model for parametric Fano profiles and demonstrates its application to a chirped waveguided plasmonic crystal.

Findings

The model accurately describes optical responses in non-spectral domains.

Application to CWPC shows potential for spectrometer-free nanodevice design.

The approach broadens Fano resonance analysis beyond spectral line shapes.

Abstract

Fano resonance observed in various classical and quantum systems features an asymmetric spectral line shape. For designing nanoresonators for monochromatic applications, it is beneficial to describe Fano resonance in non-spectral parametric domains of critical structural parameters. We develop the analytical model of the parametric Fano profile based on a coupled harmonic oscillator (CHO) model and theoretically demonstrate its application in describing the optical response of a chirped waveguided plasmonic crystal (CWPC). The developed parametric Fano model may find applications in the design of monochromatic and spectrometer-free nanodevices.