Controllable optical response and tunable sensing based on self interference in waveguide QED systems

TL;DR

This paper explores how self interference in waveguide QED systems can be harnessed to control optical responses and enhance tunable sensing, with potential applications in frequency detection and magnetic field measurement.

Contribution

It introduces a comprehensive analysis of self interference effects in waveguide QED systems and demonstrates their use in tunable optical responses and sensitive frequency sensing.

Findings

Controllable linewidth and frequency shift via self interference

Phase-dependent Fano-like line shapes in photon-magnon hybrid models

Enhanced sensitivity and tunability in magnetic field sensing

Abstract

We study the self interference effect of a resonator coupled with a bent waveguide at two separated ports. Such interference effects are shown to be similar for the cases of standing-wave and traveling-wave resonators, while in the system of two separated resonators indirectly coupled via a waveguide, the coupling forms and the related interference effects depend on which kind of resonators is chosen. Due to the self interference, controllable optical responses including tunable linewidth and frequency shift, and optical dark state can be achieved. Moreover, we consider a self-interference photon-magnon hybrid model and show phase-dependent Fano-like line shapes which have potential applications in frequency sensing. The photon-magnon hybridization can not only enhance the sensitivity and provide tunable working region, but also enables optical readout of the magnetic field strength in turn. The results in this paper provide a deeper insight into the self interference effect and its potential applications.