Wang, J.J.WangKühne, J.J.KühneKaramanos, T.T.KaramanosRockstuhl, C.C.RockstuhlMaier, Stefan A.Stefan A.MaierTittl, AndreasAndreasTittl2026-04-012026-04-01202125th International Conference on Miniaturized Systems for Chemistry and Life Sciences, Microtas 2021https://hdl.handle.net/11420/62494We demonstrate an all-dielectric crescent metasurface made of sub-wavelength silicon meta-atoms, realizing the recently introduced new physics of quasi-bound states in the continuum (quasi-BIC). The crescent metasurface supports a fundamental quasi-BIC together with a higher-order resonance with arbitrarily tunable quality factors and enhanced electromagnetic fields near the resonator surface via finely tailoring the geometry of the crescent shape. Thanks to these unique properties, such a metasurface can serve as an optical label-free sensor for multiplexed bioassays with high sensitivity and low detection limit with the potential for integrating microfluidics for in-situ on chip detection.enAll-dielectric metasurfaceBound states in the continuumHigher-order resonanceOptical sensorSensitivityTechnology::620: EngineeringConference Paper