Twist Bilayer Photonic slab's Angle-DependentGuided Resonance Analysis based on Multiple Scattering
Abstract
We present an analysis of the transmission spectra of the twisted bilayer photonic slabs using a modified rigorous coupled wave (RCWA) analysis, where the evanescent bases are replaced by bases with non-zero flux density. By utilizing the modified RCWA we demonstrate the calculation of eigenmodes, which has not been realized before. To counter for the transmission property, we propose a five-layer uniform slab approximation, with an accuracy around 0.04a/c, which is more straightforward and accessible for optical engineers compared to work by Lou et al. [Phys. Rev. Lett. 126, 136101]. The moir\'e pattern perturbation induces a split of resonance, which show great potential for engineering the band structure. Moreover, We observe two distinct transmission phases: the angle-dependent phase and Fabry-P\'erot phase, which is explained by a coupled-mode theory (CMT) with expanded channels brought by the modified eigenmodes. Our work provides a theoretical framework for the design and optimization of twisted bilayer photonic devices.
Cite
@article{arxiv.2505.09908,
title = {Twist Bilayer Photonic slab's Angle-DependentGuided Resonance Analysis based on Multiple Scattering},
author = {Wenzhu Xie and Yan Wang and Jingxuan Chen and JiaHao Si and Wei Rao and MingJin Wang and WanHua Zheng},
journal= {arXiv preprint arXiv:2505.09908},
year = {2025}
}
Comments
10 pages,5 figures, with supplemental material