| Citation: | WANG Yu, LIU Yang, HAO Xiao-yu, ZHENG Si-yu, LIU Meng, ZHANG Yu-ping, ZHAN Yi, ZHANG Hui-yun. Independent dual-band bound states in the continuum based on terahertz all-dielectric metasurfaces[J]. Chinese Optics. doi: 10.37188/CO.EN-2025-0004
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Compared to traditional single-frequency bound states in the continuum (BIC), dual-band BIC offers higher degrees of freedom and functionality. Therefore, implementing independent control of dual-band BICs can further enhance their advantages and maximize their performance. This study presents a design for a dielectric metasurface that achieves dual-band BICs in the terahertz (THz) range. By adjusting two asymmetry parameters of the structure, independent control of the two symmetry-protected BICs is achieved. Furthermore, by varying the shape of the silicon holes, the design's robustness to geometric variations is demonstrated. Finally, the test results show that the figures of merit (FOMs) for both BICs reach 109. This work provides a new approach for realizing and tuning dual-frequency BICs, offering expanded possibilities for applications in multimode lasers, nonlinear optics, multi-channel filtering, and optical sensing.
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