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

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