Inverse Design of Metamaterial Bound States in the Continuum Device via Coupled Mode Theory

We propose a novel inverse design of metamaterial bound states in the continuum (BIC) device based on resonance frequency and BIC point frequency of transmission spectrum. First, we investigate the relationship between the frequencies of resonance frequency and quasi-BIC frequency in the theoretical model by employing coupled mode theory (CMT) and Huygens principle. Based on our finding, we can obtain the inverse design of metamaterial BIC devices by using designed resonant frequency and designed quasi-BIC frequency. Furthermore, our method is universal for metamaterial BIC devices based on two metamaterial structures, which is not relative with specific structures. Our findings are based on theoretical model, simulation results, and experiments.