Topological Nature of Optical Bound States in the Continuum
Topological Nature of Optical Bound States in the Continuum
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DOI：
10.1103/physrevlett.113.257401
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发表时间：
2014-12-18
影响因子：
8.6
通讯作者：
Soljacic, Marin
中科院分区：
文献类型：
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作者：
Zhen, Bo;Hsu, Chia Wei;Soljacic, Marin
最近在光子晶体中实现了连续体光束缚态(BICs)，其中面外辐射的消失将泄漏共振转变为具有无限寿命的导模。我们发现这种BIC在远场辐射的偏振方向上是涡旋中心。它们携带守恒和量子化的拓扑电荷，由极化矢量的缠绕数定义，这确保了它们的健壮存在，并控制了它们的产生、演化和湮灭。我们的发现将光子学中强大的BIC与广泛的拓扑物理现象联系起来。
Optical bound states in the continuum (BICs) have recently been realized in photonic crystal slabs, where the disappearance of out-of-plane radiation turns leaky resonances into guided modes with infinite lifetimes. We show that such BICs are vortex centers in the polarization directions of far-field radiation. They carry conserved and quantized topological charges, defined by the winding number of the polarization vectors, which ensure their robust existence and govern their generation, evolution, and annihilation. Our findings connect robust BICs in photonics to a wide range of topological physical phenomena.