Electrically Tunable and Robust Bound States in the Continuum Enabled by 2D Transition Metal Dichalcogenide

Abstract High quality factor (Q‐factor) resonance can effectively enhance light–matter interactions, but suffers from radiative losses caused by fabrication imperfections and material impurities. Merging bound states in the continuum (BICs) becomes a promising candidate to address this challenge since they generate a large high‐Q region in momentum space against undesired external perturbations. However, it is only achieved by altering the geometric parameters of the structure, which constrains its dynamical tunability once the fabrication is ready, limiting its performance in modulators and photodetectors. Here, a convenient approach is proposed to manipulating the merging BIC by electrically tuning the material properties, aiming at on‐chip photonic devices. The asymmetric merging BIC is achieved and tuned by reducing the in‐plane structural symmetry from to , which enables the inversion of topological charge and reconfigurable polarization distribution in the momentum space. Such tunable merging BIC promises various potential applications including vortex generation, optical communication, and nanolasers.