磁提升BIC对称性保护实现非互易光束偏转与角度信息编码
Magnetic Lifting of BIC Symmetry Protection Enables Nonreciprocal Beam Steering and Angular Information Encoding
- School of Mechanical Science and Engineering, Huazhong University of Science and Technology（华中科技大学机械科学与工程学院）
- Advanced Quantum Architecture Laboratory (AQUA), Ecole Polytechnique Federale de Lausanne (EPFL)（洛桑联邦理工学院先进量子架构实验室）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究通过磁提升连续谱束缚态的对称性保护，在磁光光子晶体中实现非互易光束偏转，并利用波长与仰角、偏振与方位角的锁定关系进行角度信息编码，为多维LiDAR和集成光学提供新途径。
AI中文摘要：
对称性保护的连续谱束缚态（SP-BICs）提供了卓越的光学约束，但保持非辐射特性。在此，我们证明磁提升其保护对称性能够实现具有内在角度信息编码的非互易光束偏转。在磁光光子晶体平板中，面内磁场将SP-BIC转变为辐射准BIC，并结合垂直介电不对称性，连续地将相关能带极值从Gamma点移开。偏转光束表现出两个独立的锁定关系：其波长锁定到仰角，而偏振方向锁定到方位角。这些关系将互补的光谱和偏振信息嵌入扫描光束中，为多维LiDAR提供额外的传感通道。此外，非互易色散在相反波矢处给出不同的共振频率，支持在+k处共振发射，而相同频率下的背向反射光在-k处失谐，开辟了内在自隔离和减少光学反馈的途径。这些发现建立了一个连接磁光束偏转、角度信息编码和非互易反馈抑制的统一框架，为紧凑可重构光源和集成光学引擎提供了前景。
英文摘要：
Symmetry-protected bound states in the continuum (SP-BICs) offer exceptional optical confinement but remain nonradiative. Here, we demonstrate that magnetically lifting their protecting symmetry enables nonreciprocal beam steering with intrinsic angular information encoding. In a magneto-optical photonic crystal slab, an in-plane magnetic field converts an SP-BIC into a radiative quasi-BIC and, together with vertical dielectric asymmetry, continuously displaces the associated band extremum away from the Gamma point. The steered beam exhibits two independent locking relations: its wavelength is locked to the elevation angle, while its polarization orientation is locked to the azimuthal angle. These relations embed complementary spectral and polarization information into the scanning beam, providing additional sensing channels for multidimensional LiDAR. Moreover, the nonreciprocal dispersion gives different resonance frequencies at opposite wave vectors, supporting resonant emission at +k while back-reflected light at the same frequency is off resonance at -k, opening a route to intrinsic self-isolation and reduced optical feedback. These findings establish a unified framework connecting magnetic beam steering, angular information encoding, and nonreciprocal feedback suppression, with prospects for compact reconfigurable light sources and integrated optical engines.
