Robust high- Q Fano resonances induced by symmetry breaking in all-dielectric metamaterials
Year: 2026
Type: article
Abstract: Although dielectric metasurfaces can support high- Q resonances, functional applications require resonances that preserve strong radiative coupling and robustness against fabrication inaccuracies. High- Q Fano resonances are studied in a periodic hydrogenated amorphous silicon (a-Si:H) micropillar metasurface on a MgF 2 substrate in the mid-infrared region. Symmetry breaking is proposed by laterally displacing the central micropillar within the unit cell, giving rise to two radiative high- Q Fano resonances. The wavelength–asymmetry dispersion shows the emergence and spectral evolution of the resonance branches with increasing asymmetry. Multipole decomposition and field distributions reveal that the resonances are mainly governed by magnetic and toroidal dipole interactions. Furthermore, the designed metasurface exhibits stable resonance characteristics under a dimensional variation of up to ± 20 nm , indicating good fabrication tolerance. These results provide a promising platform for high- Q mid-infrared photonics and sensing applications.
Source: Journal of Optics
Author: Sehnaz Kanli
Institution: Altınbaş University
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,325
OpenAlex ID: W7204252237