Twist-tunable moiré optical resonances
arXiv:2211.11263 · doi:10.1103/PhysRevB.107.155402
Abstract
Multilayer stacks of twisted optical metasurfaces are considered as a prospective platform for chiral nanophotonic devices. Such structures are primarily used for the realization of circularly polarized light sources, artificial optical rotation, and circular dichroism. At the same time, the behavior of their hybrid photonic modes is strongly affected by the moiré-pattern of superimposed periodic constituents. In this work, we show that moiré-periodicity in bilayer dielectric photonic crystal slabs leads to an arise of unlimitedly narrow optical resonances, which are very sensitive to the relative twist and gap width between the sublayers. We demonstrate the structure providing twist-tuning of the hybrid mode wavelength in the range of 300--600~nm with quality factor varying from~~up~to~ correspondingly. The obtained results pave the wave for the utilization of moiré-assisted effects in multilayer photonic crystal slabs.
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