时间反演对称性破缺实现手性连续域束缚态的实验演示
Experimental Demonstration of Chiral Bound States in the Continuum Enabled by Time-reversal Symmetry Breaking
- Sun Yat-sen University（中山大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文在磁光光子晶体中实验实现时间反演对称性破缺诱导的手性连续域束缚态，通过面外磁场分裂简并BIC对，产生相反圆偏振的非简并共振，并验证了自旋选择性辐射与宽带圆二色性，为自旋选择性光子学提供新平台。
AI中文摘要：
连续域束缚态（BICs）为实现具有消失辐射损耗和增强光-物质相互作用的光学共振提供了一条强大途径。特别令人感兴趣的是手性BICs，其共振态表现出固有的圆偏振和自旋选择性辐射。最近有理论预测，磁光光子晶体可通过时间反演对称性破缺来承载此类态。在此，我们实验演示了在磁光光子晶体中由时间反演对称性破缺诱导的手性BICs，其中面外磁场将一个简并的BIC对提升为两个具有相反圆偏振的非简并共振。数值模拟揭示了相关的手性相位涡旋和强烈的自旋选择性辐射，而微波测量通过角度分辨透射光谱和显著的宽带圆二色性证实了预测的行为。我们的结果为在磁光光子结构中探索手性BIC物理建立了一个实验平台，为自旋选择性光子学开辟了新的机遇。
英文摘要：
Bound states in the continuum (BICs) provide a powerful route to optical resonances with vanishing radiation loss and enhanced light-matter interactions. Of particular interest are chiral BICs, whose resonant states exhibit intrinsic circular polarization and spin-selective radiation. Magneto-optical photonic crystals have recently been predicted to host such states through time-reversal-symmetry breaking. Here, we experimentally demonstrate chiral BICs induced by time-reversal symmetry breaking in a magneto-optical photonic crystal, where an out-of-plane magnetic field lifts a degenerate BIC pair into two nondegenerate resonances with opposite circular polarizations. Numerical simulations reveal the associated chiral phase vortices and strong spin-selective radiation, while microwave measurements confirm the predicted behavior through angle-resolved transmission spectra and pronounced broadband circular dichroism. Our results establish an experimental platform for exploring chiral BIC physics in magneto-optical photonic structures, opening new opportunities for spin-selective photonics.
