电波科学学报2026，Vol.41Issue(1)：148-154,7.DOI:10.12265/j.cjors.2025163
基于拓扑保护的高Q值太赫兹超表面
High-Q factor terahertz metasurface based on topological protection
摘要
Abstract
Traditional THz devices have long been constrained by radiation losses caused by the diffraction limit,with quality factors generally below 105,severely limiting communication and sensing performance.To address this technical bottleneck,this study proposes a silicon-based metasurface design with C6v symmetry based on the theory of topological photonics to achieve topologically protected high-Q factor resonance in the terahertz(THz)frequency band.By constructing a triangular lattice photonic crystal slab,cylindrical etched holes are introduced within the unit cell to preserve symmetry,and ideal magnetic conductor boundary conditions are employed to separate TE modes,thereby incorporating the topological protection mechanism of bound states in the continuum(BIC)into the THz frequency band.The results show that the Q factor reaches 1010 at the Γ point,and the BIC is located at the center of the polarization vortex in the far-field radiation,verifying the BIC mechanism and its topological properties.The simulation results are excellent.Ultimately,the Q factor is improved by several orders of magnitude compared to traditional devices,and the topological protection mechanism can significantly suppress the impact of processing defects and environmental disturbances on resonance performance,providing a new paradigm for low-loss communication devices,optical programmable technology,and quantum light source design.关键词
拓扑电荷/连续域束缚态(BIC)/太赫兹(THz)/超表面/光子晶体Key words
topological charge/bound states in the continuum/terahertz(THz)/metasurfaces/photonic crystals分类
信息技术与安全科学引用本文复制引用
任群,姚建铨,张昭阳,王秀宇,黄昊,何柳,张璋,谭琪,徐航,游检卫..基于拓扑保护的高Q值太赫兹超表面[J].电波科学学报,2026,41(1):148-154,7.基金项目
国家自然科学基金(62101078) （62101078）
苏州市科技发展计划(ZXL2023174)National Natural Science Foundation of China(62101078) （ZXL2023174）
Suzhou Science and Technology Development Plan(ZXL2023174) （ZXL2023174）
