Fig. 1: The twisted bilayer photonic crystal (TBPC) system. | Nature Communications

Fig. 1: The twisted bilayer photonic crystal (TBPC) system.

From: Twisted moiré photonic crystal enabled optical vortex generation through bound states in the continuum

Fig. 1

a Schematic of TBPC with optical vortex emitted from the AA stacking regions to both +z and −z directions. The height and diameter of the disks are 220 nm and 450 nm, respectively. The lattice constant of monolayer honeycomb PhC is 1.0 μm. b Schematic view of the twist-enabled energy transfer between free space light beams and at-Γ BIC modes through guided resonances.

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