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

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