Photon-photon coupling induced bound state in the continuum and transparency

TL;DR

This paper demonstrates how coherent and dissipative coupling in hybrid photonic resonators can induce bound states in the continuum and enable transparency, with potential applications in quantum devices and sensors.

Contribution

It introduces a method to realize BIC and coupling-induced transparency in photonic resonators through interference control and parameter tuning.

Findings

Observation of BIC near resonator crossing frequencies.

Achieved coupling-induced transparency via sample rotation.

Transition from BIC to transparency controlled by parameters.

Abstract

This study presents the coherent and dissipative coupling realized in the hybrid photonic resonators that have been achieved via the constructive and destructive interference of the photonic resonator fields with the radiation of a common transmission line fed with microwave photons. In the dissipative coupling regime we have found the coexistence of a peculiar phenomenon bound state in the continuum (BIC) near the crossing of frequency of the uncoupled resonators by satisfying the Friedrich-Wintgen BICs condition. Again just by rotating one of the samples and with the dynamic adjustment of a parameter we have achieved coupling induced transparency between the photonic resonators. This transition from BIC in the absorption regime to transparency opens avenues for different sorts of plain or programmable oscillators, filters, quantum information processors, sensors etc.