Active optical modulation of quasi-BICs in Si–VO2 hybrid metasurfaces

• DOI: 10.1364/ol.472927
• Publication Date: 2022-09-30T13:01:14Z
• Authors: Yao Zhang; Deliang Chen; Wenbin Ma; Shaojun You; Jing Zhang; Menghui Fan; Chaobiao Zhou
• Keywords: Modulation (music)

Active optical modulation breaks the limitation of a passive device, providing new, to best our knowledge, alternative achieve high-performance devices. The phase-change material vanadium dioxide (VO2) plays an important role in active device due its unique reversible phase transition. In this work, we numerically investigate resonant Si-VO2 hybrid metasurfaces. bound states continuum (BICs) Si dimer nanobar metasurface are studied. quasi-BICs resonator with high quality factor (Q-factor) can be excited by rotating one nanobars. multipole response and near-field distribution confirm that magnetic dipoles dominate resonance. Moreover, dynamically tunable resonance is achieved integrating VO2 thin film nanostructure. With increase temperature, gradually changes from dielectric state metal state, exhibits significant change. Then, transmission spectrum calculated. Situations where located different positions also discussed. A relative 180% achieved. These results fully shows excellent ability modulate resonator. Our work provides route for