# Towards Hosting Bound State in Continuum in Specialty Optical Microcavity

## TL;DR

This paper demonstrates how to host a Bound State in Continuum (BIC) in an optical microcavity by tuning gain-loss profiles, leading to high-Q resonances with potential applications in photonics.

## Contribution

It introduces a novel approach to realize BIC in a non-uniformly pumped microcavity through interaction of proximity resonances and S-matrix modeling.

## Key findings

- Divergence of Q-factor at BIC point
- High lifetime resonance achieved through gain-loss tuning
- Stability analyzed via Petermann factor

## Abstract

We exploit the interaction between supported proximity resonances in an open non-uniformly pumped optical microcavity to host a Bound State in Continuum (BIC). Using the modeling of the S-matrix, we study the coupling between the interacting states forming a BIC. We report the divergence of Quality Factor (Q-factor) of one of the interacting states, numerically demonstrated with the appropriate tuning of the spatial variation of unequal gain-loss within the system whose stability has been discussed in terms of the Petermann factor at the point of BIC. Such high lifetime has been marked as a signature of BIC.