论文标题
连续体的合并结合状态的巨型超级手术场
Giant superchiral field at merged bound states in the continuum
论文作者
论文摘要
超级手续场对于超敏感的手性物体非常重要，并且已经被深入探索。尽管取得了进展，但从根本上限制了具有巨大手性（C）的纳米结构中电磁场的构建。在这里，我们演示了一种新型的方法，可以在ACHIRAL介电元信息中构建超手体场。由于量子旋转效应，连续体（BIC）中的每个受对称保护的结合态都具有支持γ点附近超级手术场的能力。通过将两个BIC与正交的极化合并，满足了超级手续场的所有标准，并且手性的显着增强变得更加稳健。使用典型的光子晶体平板，我们产生了一个超级手杆磁场，其增强因子（C/C_CPL）比纳米结构中的最先进的数量级高。通过进一步引入活跃的手性培养基，手性光 - 摩擦性相互作用形成了与圆形二色性（CD）巨大增强相关的手性模式分裂。
Superchiral field is highly important for ultrasensitive detection of chiral objects and has been intensively explored. Despite the progress, the construction of electromagnetic field in achiral nanostructures with giant chirality (C) is fundamentally restricted. Here, we demonstrate a novel approach to construct superchiral field in achiral dielectric metasurfaces. Due to the quantum spin-hall effect, each symmetry-protected bound state in the continuum (BIC) exhibits the ability to support a superchiral field in vicinity of Γpoint. By merging two BICs with orthogonal polarizations, all the criteria for a superchiral field are satisfied and the dramatic enhancement of chirality becomes more robust. Using typical photonic crystal slabs, we have produced a superchiral field with enhancement factor (C/C_CPL) orders of magnitude higher than state-of-the-art in nanostructures. By further introducing active chiral medium, a chiral mode splitting associated with giant enhancement of circular dichroism (CD) has been formed by the chiral light-matter interaction.
