Theory for Twisted Bilayer Photonic Crystal Slabs

We analyze scattering properties of twisted bilayer photonic crystal slabs through a high-dimensional plane wave expansion method. The method is applicable for arbitrary twist angles and does not suffer from the limitations of the commonly used supercell approximation. We show strongly tunable resonance properties of this system which can be accounted for semianalytically from a correspondence relation to a simpler structure. We also observe strongly tunable resonant chiral behavior in this system. Our work provides the theoretical foundation for predicting and understanding the rich optical physics of twisted multilayer photonic crystal systems.Received 21 October 2020Accepted 3 March 2021DOI:https://doi.org/10.1103/PhysRevLett.126.136101© 2021 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasNanophotonicsCondensed Matter, Materials & Applied Physics