Transmission properties of microwaves at an optical Weyl point in a three-dimensional chiral photonic crystal

Microwave transmission measurements were performed for a three-dimensional (3D) layer-by-layer chiral photonic crystal (PhC), whose photonic band structure contains 3D singular points, Weyl points. For the frequency and wavevector in the vicinity of a Weyl point, the transmitted intensity was found to be inversely proportional to the square of the propagation length. In addition, the transmitted wave was well-collimated in the plane parallel to the PhC layers, even for point-source incidence. When a plane wave was incident on the PhC containing metal scatters, the planar wavefront was reconstructed after the transmission, indicating a cloaking effect. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

Microwave transmission measurements were conducted on a three-dimensional layer-by-layer chiral photonic crystal with 3D singular points, Weyl points. It was found that the transmitted intensity near a Weyl point is inversely proportional to the square of the propagation length. The transmitted wave was well-collimated in the plane parallel to the PhC layers, even for point-source incidence, and a cloaking effect was observed when a plane wave was incident on the PhC containing metal scatters.