Topological nature of optical bound states in the continuum

Bo Zhen, Chia Wei Hsu, Ling Lu, A. Douglas Stone and Marin Solja?i?

Working Paper from Harvard University OpenScholar

Abstract: 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.

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