Ultra-high Q-factor quasi-BIC BaTiO3 metasurface for electro-optic modulation

• DOI: 10.1364/oe.522746
• Publication Date: 2024-05-03T16:00:59Z
• Authors: Xiaokang Shen; Haiyi Tian; Jiahao Li; Yunkai Wu; Xu Wang
• Keywords: Modulation (music); Q factor

Metasurfaces play a crucial role in trapping electromagnetic waves with specific wavelengths, serving as significant platform for enhancing light-matter interactions. In all kinds of dynamic modulation metasurfaces, electro-optic metasurfaces have attracted much attention due to its advantages fast, stable and high efficiency. order respond the extremely weak refractive index change electro-optical effect materials, are required support optical signals Q values. The quasi-bound state continuum (Q-BIC) is often used enhance light-field capability improve sensitivity modulators ability generate Q-factor resonances. However, design an metasurface that facilitates application voltage achieves efficiency nearly 100% still urgent need development. this study, single-crystal BTO modeled using finite-difference time-domain method, structural symmetry broken introduce Q-BIC resonance signal 2.45 × 10