Universal coupled theory for metamaterial Bound states in the continuum

TL;DR

This paper introduces a universal coupled theory for metamaterial BICs that accurately predicts ultra-high Q resonances and transmission spectra, surpassing previous models in precision for strong coupling scenarios.

Contribution

The paper presents a new analytical coupled theory for metamaterial BICs that improves accuracy in modeling ultra-strong mode coupling and transmission spectra.

Findings

Accurately predicts transmission spectra of metamaterial BICs.

Provides a more precise model for ultra-strong mode coupling.

Enhances understanding of phase coupling in bright modes.

Abstract

In this paper, we present a novel universal coupled theory for metamaterial Bound states in the continuum (BIC) or quasi-Bound states in the continuum (quasi-BIC) which provides ultra-high Q resonance for metamaterial devices. Our theory analytically calculates the coupling of two bright modes with phase. Our method has much more accuracy for ultra-strong coupling comparing with the previous theory (the coupling of one bright mode and one dark mode). Therefore, our theory is much more suitable for BIC or quasi-BIC and we can accurately predict the transmission spectrum of metamaterial BIC or quasi-BIC for the first time.