| Citation: | YANG Yue, YAO Bu-yi, DAI Hai-tao, HAO Xi-chen, WANG Yu-han, WANG Ruo-tong, GUO Ting-yang, DU Wen, GAO Ming, TAN Qi, LI Ji-ning, YAO Jian-quan. Tunable terahertz chiral response in all-dielectric BIC metasurfaces[J]. Chinese Optics. doi: 10.37188/CO.EN-2025-0045
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Chiral metasurfaces play critical role in physics, materials science, pharmacognosy, and communications. To achieve high-performance chiral responses, such as high circular dichroism (CD) and high-quality factors (Q-factors), BIC-based metasurfaces have been extensively studied as a promising platform. However, most realized BIC metasurfaces rely on metallic constituents whose high electromagnetic losses and absence of dynamic chirality tuning together impose a severe limit on their practical potential. This paper presents an all-dielectric chiral BIC metasurface. By illumination symmetry breaking, the metasurface exhibits a CD value of 0.93. Additionally, dynamic tuning of CD is enabled by external optical pumping. This scheme provides a new avenue for dynamically manipulating the chiral metasurface, which can be used to achieve more complex dynamic chiral characterization and applications.
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