Abstract
The study of twisted bilayer 2D materials has revealed many interesting physics properties. A twisted moiré photonic crystal is an optical analog of twisted bilayer 2D materials. The optical properties in twisted photonic crystals have not yet been fully elucidated. In this paper, we generate 2D twisted moiré photonic crystals without physical rotation and simulate their photonic band gaps in photonic crystals formed at different twisted angles, different gradient levels, and different dielectric filling factors. At certain gradient levels, interface modes appear within the photonic band gap. The simulation reveals “tic tac toe”-like and “traffic circle”-like modes as well as ring resonance modes. These interesting discoveries in 2D twisted moiré photonic crystal may lead toward its application in integrated photonics.
Highlights
IntroductionReducing the dimensionality of a material system very often leads to exceptional electronic, optical, and magnetic properties because of enhanced quantum effects in reduced phase space [1]
We simulated photonic band structures in moiré photonic crystals with a twist angle of 9.5 degrees obtained at various z-locations
With increasing z-location, the size of all three band gaps decreases and the frequency ranges of the photonic band gaps are almost same
Summary
Reducing the dimensionality of a material system very often leads to exceptional electronic, optical, and magnetic properties because of enhanced quantum effects in reduced phase space [1]. The recent discovery of superconductivity in magic-angle twisted bilayer graphene [4] has triggered another wave of research in moiré 2D materials [5,6,7,8,9,10,11,12,13,14,15,16,17,18]
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