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