论文标题
扭曲可调的Moiré光学共振
Twist-tunable moiré optical resonances
论文作者
论文摘要
扭曲的光学跨面的多层堆栈被认为是手性纳米光子设备的前瞻性平台。此类结构主要用于实现圆形极化光源，人造光旋转和圆形二色性。同时，它们的杂交光子模式的行为受到叠加的周期成分的莫伊尔 - 图案的强烈影响。在这项工作中，我们表明，双层介电光子晶体平板中的Moiré-周期性导致出现无限窄的光学共振，这对子层之间的相对扭曲和间隙宽度非常敏感。我们演示了在300--600〜nm范围内提供混合模式波长的结构，质量因子从〜$ 10^2 $ 〜UP〜到〜$ 10^5 $不等。获得的结果铺平了波浪在多层光子晶体平板中利用Moiré辅助效应的波浪。
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~$10^2$~up~to~$10^5$ correspondingly. The obtained results pave the wave for the utilization of moiré-assisted effects in multilayer photonic crystal slabs.
