Phys.org May 26, 2023
The most common strategy to apply bound states in the continuum (BICs) in a metasurface is by breaking symmetry of resonators in the uniform array that leaks the otherwise uncoupled mode to free space and exhibits an inverse quadratic relationship between quality factor (Q) and asymmetry. Researchers in China have proposed a scheme to further reduce scattering losses and improve the robustness of symmetry protected BICs by decreasing the radiation density with a hybrid BIC lattice. They observed a significant increase of radiative Q in the hybrid lattice compared to the uniform lattice. In the hybrid BIC lattice, modes are transferred to Г point inherited from high symmetric X, Y, and M points in the Brillouin zone that reveal as multiple Fano resonances in the far field and would find applications in hyperspectral sensing. According to the researchers their work initiates a novel and generalized path toward reducing scattering losses and improving the robustness of BICs in terms of lattice engineering… read more. TECHNICAL ARTICLEÂ
Hybrid BIC lattices. (a–c) Schematic diagram of symmetry-protected BIC lattice without radiation channel… Credit: Opto-Electronic Science, Vol. 2, Number 4, 2023 Â