Photonic Band Gaps and Resonance Modes in 2D Twisted Moiré Photonic Crystal

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.

Holographic Fabrication of 3D Moiré Photonic Crystals Using Circularly Polarized Laser Beams and a Spatial Light Modulator

“…Overall, the interference orientation and period are determined by the wave-vector difference k n − k m . The square pattern formed by the wave-vector difference k n − k m indicated by four solid lines in Figure 1 c is twisted by an angle of α, away from the pattern formed by k n − k m indicated by four dashed lines [ 28 , 53 ].…”

Direction- and polarization-tunable spontaneous emission beneficial from diffraction orders of a square R6G-nanopore array

“…The intrinsic optical properties of 2D PCs are closely interrelated with structural characteristics, such as the symmetry of lattice arrangement and the size and components of the unit cell. [26][27][28] Thereinto, the far-eld diffraction orders (DOs) depending on the symmetry of lattice arrangement play a key role in analyzing the interaction between light and matter in different directions and polarizations effectively; 29 on top of that, the size of the unit cell provides a better-matched resonance energy for the system between the emitters and the optical cavity.…”

GaN Magic Angle Laser in a Merged Moiré Photonic Crystal

“…Moiré photonic crystals, inspired by moiré electronic systems like twisted bilayer graphene, − have recently garnered attention for their potential as novel, light-confining structures. − Consisting of two stacked photonic crystals separated by a subwavelength interlayer separation distance, moiré photonic crystal systems achieve flat photonic bands when the two photonic crystal layers are twisted at a so-called “magic” angle with respect to each other. As shown in Figure a, the bilayer moiré system can also be collapsed into a single photonic crystal layer, which we refer to as a “merged” moiré structure.…”