AI 中文总结
研究如何通过混合对称性破缺产生和控制连续统中手性准束缚态，结合多个正交对称微扰，实现了偏振态控制及动态手性重构，证明光学手性可由对称性工程产生，为手性光子态设计提供通用框架。
AI 中文摘要
手性光学模式为自旋选择性光与物质相互作用提供了一个基本平台，并支撑着从手性发射到偏振控制光子器件等新兴应用。它们通常通过定制特定的结构不对称性来直接诱导圆偏振辐射。在此，我们引入混合对称性破缺作为一种产生和控制连续统中手性准束缚态（qBICs）的通用途径。通过组合多个正交对称微扰，在手性非手性光子结构中出现光学手性，并从线偏振连续演变为圆偏振。基于宇称的分析表明，手性qBICs源自宇称允许的辐射通道的对称控制演化。我们展示了该方法在多个BIC平台上的通用性，实现了几乎整个庞加莱球上偏振态的确定性控制，并通过相变材料在固定结构中进一步建立了动态手性重构。更广泛地说，我们的结果表明光学手性可以通过对称性工程产生，为手性光子态的设计提供了一个通用框架。
英文摘要
Chiral optical modes provide a fundamental platform for spin selective light matter interactions and underpin emerging applications ranging from chiral emission to polarization-controlled photonic devices. They are typically achieved by tailoring specific structural asymmetries to directly induce circularly polarized radiation. Here, we introduce hybrid symmetry breaking as a general route for generating and controlling chiral quasi-bound states in the continuum (qBICs). By combining multiple orthogonal symmetry perturbations, optical chirality emerges in otherwise achiral photonic structures and evolves continuously from linear to circular polarization. A parity based analysis reveals that the chiral qBICs originate from the symmetry-controlled evolution of parity allowed radiative channels. We demonstrate the universality of the approach across multiple BIC platforms, achieve deterministic control of the polarization state across nearly the entire Poincare sphere, and further establish dynamic chirality reconfiguration in a fixed structure through a phase-change material. More broadly, our results demonstrate that optical chirality can emerge from symmetry engineering, providing a general framework for the design of chiral photonic states.
