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arXiv · 1905.00215

Super Bound States in the Continuum on Photonic Flatbands: Concept, Experimental Realization, and Optical Trapping Demonstration

Ngoc Duc Le·Paul Bouteyre·Ali Kheir-Aldine·Florian Dubois·Sébastien Cueff·Lotfi Berguiga·Xavier Letartre·Pierre Viktorovitch·Taha Benyattou·Hai Son Nguyen
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Abstract

In this work, we theoretically propose and experimentally demonstrate the formation of a super bound state in a continuum (BIC) on a photonic crystal flat band. This unique state simultaneously exhibits an enhanced quality factor and near-zero group velocity across an extended region of the Brillouin zone. It is achieved at the topological transition when a symmetry-protected BIC pinned at $k=0$ merges with two Friedrich-Wintgen quasi-BICs, which arise from destructive interference between lossy photonic modes of opposite symmetries. As a proof-of-concept, we employ the super flat BIC to demonstrate three-dimensional optical trapping of individual particles. Our findings present a novel approach to engineering both the real and imaginary components of photonic states on a subwavelength scale for innovative optoelectronic devices.

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Ngoc Duc Le, Paul Bouteyre, Ali Kheir-Aldine, Florian Dubois, Sébastien Cueff, Lotfi Berguiga, Xavier Letartre, Pierre Viktorovitch, Taha Benyattou, Hai Son Nguyen. 2019-05-01. Super Bound States in the Continuum on Photonic Flatbands: Concept, Experimental Realization, and Optical Trapping Demonstration. https://doi.org/10.1103/physrevlett.132.173802

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