arXiv:2610.11500 · v2
Learning qBIC Resonances across Metasurface Families in Dielectric Fourier Space
摘要
Bound states in the continuum (BIC) metasurfaces are typically described by geometry-specific parameters, hindering cross-geometry comparison, while ultranarrow quasi-BIC (qBIC) features are easily diluted in full-spectrum learning. Here, we map 2,015 samples from seven dielectric metasurface families onto a shared reciprocal-lattice grid. Two fixed low-order Fourier descriptors capture within-branch resonance shifts, with mean $R^2$ values of 0.871-0.999. Field-level analysis of two representative branches shows that these shifts are consistent with the Maxwell-Fourier perturbation picture. A five-channel Fourier-space backbone models the broadband spectrum. A local resonance expert uses complex Fourier coefficients to parameterize the qBIC resonance through a differentiable Fano layer. The expert reduces resonance-position mean absolute error (MAE) from 3.2 to 0.95 nm and reduces the minimum-transmission MAE by a factor of 14 on a geometry-blocked test set. The same coordinate supports spectrum-to-structure reconstruction.
作者备注：59 pages,5 main figures and 1 main table; includes Supplementary Information with 27 supplementary figures and 3 supplementary tables.v2: Expanded theoretical analysis, added cross-family generalization experiments, improved figures and supplementary information, and corrected simulation parameter descriptions. Data and code are publicly available