Resonance Wavelength\nStabilization of Quasi-Bound\nStates in the Continuum Constructed by Symmetry Breaking and Area\nCompensation

Dielectric metasurface supported symmetry-protected bound\nstates\nin the continuum (SP-BIC) provide an important platform for enhancing\nlight–matter interactions. However, the conversion of SP-BIC\ninto quasi-BIC (QBICs) through symmetry breaking is often accompanied\nby a shift in the resonance wavelength. In this work, we present a\ngeneralized viewpoint aimed at achieving the wavelength stability\nof QBICs through symmetry breaking and area compensation (SBAC). Three\nSBAC schemes we propose are equal proportional compensation along\nboth <i>x</i>- and <i>y</i>-directions and equal\nproportional compensation along <i>x</i>-direction only\nor <i>y</i>-direction only. The QBICs resonance wavelengths\nstabilized at about 1200, 1520, and 1434 nm are achieved in monomer,\ndimer, and tetramer metasurfaces, respectively. Finally, we perform\nan experimental demonstration in a nanohole dimer photonic crystal\nslab. The QBICs resonance wavelength stabilized at 1658 nm for SBAC.\nOur approach provides new routes for realizing QBICs with a stable\nwavelength and tunable Q-factor.