Resonance modes in moire photonic patterns for twistoptics

Twistronics has been studied for manipulating electronic properties through a twist angle in the formed moire superlattices of two dimensional layer materials. In this paper, we study twistoptics for manipulating optical properties in twisted moire photonic patterns without physical rotations. We describe a theoretic approach for the formation of single-layer twisted photonic pattern in square and triangular lattices through an interference of two sets of laser beams arranged in two cone geometries. The moire period and the size of unit super-cell of moire patterns are related to the twist angle that is calculated from the wavevector ratio of laser beams. The bright and dark regions in moire photonic pattern in triangular lattices are reversible. We simulate E-field intensities and their cavity quality factors for resonance modes in moire photonic pattern in square lattices. Due to the bandgap dislocation between the bright and dark regions, the resonance modes with very high quality-factors appears near bandgap edges for the moire photonic pattern with a twist angle of 9.5 degrees. At the low frequency range, the resonance modes can be explained as Mie resonances. The cavity quality factor decreases for resonance modes when the twist angle is increased to 22.6 degrees. (c) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

This paper studies twistoptics for manipulating optical properties in twisted moire photonic patterns without physical rotations, utilizing laser beams interference to create single-layer twisted photonic patterns in square and triangular lattices. Through simulations and calculations, it is found that twistoptics can generate resonance modes with high cavity quality factors in moire photonic patterns, which is significant for the design and application of optical devices.