Fig. 1

a Schematic of the all-dielectric superlattice metasurface supporting displacement-mediated quasi-BICs. The unit cell consists of three silicon nanobeams with different local displacement (d₁) and global displacement (d₂). Three representative unit cells with different △d are shown on the right panel: △d = − 200 nm (green circle), △d = 0 nm (red circle), and △d = 100 nm (blue circle). b The transmission spectra with respect to △d. The color circle symbols represent the resonance peak of quasi-BIC with three different △d as indicated in (a). c Dependence of the Q-factor and resonance wavelength of the quasi-BIC mode on △d