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arXiv · 2505.09908

Twist Bilayer Photonic slab's Angle-DependentGuided Resonance Analysis based on Multiple Scattering

Wenzhu Xie·Yan Wang·Jingxuan Chen·JiaHao Si·Wei Rao·MingJin Wang·WanHua Zheng
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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.

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Wenzhu Xie, Yan Wang, Jingxuan Chen, JiaHao Si, Wei Rao, MingJin Wang, WanHua Zheng. 2025-05-15. Twist Bilayer Photonic slab's Angle-DependentGuided Resonance Analysis based on Multiple Scattering. https://arxiv.org/abs/2505.09908

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