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This work examines a symmetry-protected bound state in the continuum (BIC)supported unique all-dielectric dome-shaped metasurface (MS). The simple unitMS is made up of four dome-shaped nanobars of silicon in the top layer andsilica glass as the substrate. Two strong transmission dips denoted as anelectric dipole (ED) and magnetic dipole (MD) quasi-BIC with a high Q-factorthat surpasses the value of 104 are observed after the symmetry between thenanobars is broken by a small angle from their initial position. A crossoverbetween the ED and MD resonances is noticed when the periodicity of the MS ischanged in the y direction. In addition, transmission spectra show theavoided-crossing phenomenon of dipole quasi-BIC resonances when thesuperstrate's refractive index (RI) is reduced from its initial value. Otherwidely used dielectric materials are additionally employed in dome-shapednanobars to evaluate their performances in terms of sharpness and near-zerotransmission. Moreover, Other forms of symmetry breakdown such as diagonalwidth and length asymmetry have been investigated for their impact on theQ-factor. Finally, we have demonstrated two significant applications, includingrefractometric glucose sensing and third harmonic generation (THG). Ourdome-shaped MS is roughly 300 times more efficient at generating thirdharmonics than a flat rectangular silicon film MS. Our proposed BIC andq-BIC-facilitated MS may provide a method for enhancing the functionality ofbiological sensors, multimodal lasing, optical switches, and nonlinear optics.

Bound State in the Continuum Supported Asymmetric Dome-shaped Dielectric Metasurface: Crossing and Avoided Crossing of Transmission with Applications