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arXiv 2406.11204physics.optics
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具有任意偏振和本征手性的磁可调光学连续域束缚态

Magnetically tunable optical bound states in the continuum with arbitrary polarization and intrinsic chirality

Qing-an Tu, Hongxin Zhou, Yan Meng, Maohua Gong, Zhen Gao

AI总结:

本文基于磁光光子晶体平板,通过外磁场打破时间反演对称性并进一步打破面内反演对称性,实现了覆盖整个庞加莱球的磁可调BICs及位于Γ点、圆二色性超过0.99、品质因子达46000的本征手性BICs。

摘要:

光学连续域束缚态(BICs)是嵌入在连续谱中的奇异局域本征态,也是动量空间中的拓扑偏振奇点,在基础物理和应用物理领域都引起了广泛关注。本文基于置于外磁场中以打破时间反演对称性的磁光光子晶体平板,从理论上证明了磁可调BICs,其具有覆盖整个庞加莱球的任意偏振,以及圆偏振态的高效离Γ手性发射。更有趣的是,通过进一步打破磁光光子晶体平板的面内反演对称性,从被消除的BICs中产生一对圆偏振态(C点),并调节外磁场强度使其中一个C点移动到Γ点,可以观察到位于Γ点的本征手性BICs,其圆二色性接近1,超过0.99,并且由于保留了面外镜面对称性而具有高达46000的品质因子。这些发现可能在手性光学效应、结构光和可调光学器件等领域带来大量潜在应用。

英文摘要:

Optical bound states in the continuum (BICs), which are exotic localized eigenstates embedded in the continuum spectrum and topological polarization singularity in momentum space, have attracted great attentions in both fundamental and applied physics. Here, based on magneto-optical photonic crystal slab placed in external magnetic fields to break the time-reversal symmetry, we theoretically demonstrate magnetically tunable BICs with arbitrary polarization covering the entire Poincaré sphere and efficient off-Γ chiral emission of circularly polarized states. More interestingly, by further breaking the in-plane inversion symmetry of the magneto-optical photonic crystal slab to generate a pair of circularly polarized states (C point) spawning from the eliminated BICs and tuning the external magnetic field strength to move one C point to the Γ point, one at-Γ intrinsic chiral BICs with near-unity circular dichroism exceeding 0.99 and a high quality factor of 46000 owning to the preserved out-of-plane mirror symmetry can be observed. These findings may lead to a plethora of potential applications in chiral-optical effects, structured light, and tunable optical devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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