Multi-channel angular selective window based on the epsilon-near-zero features of YaBa2Cu3O7 material and photonic crystals ceramic structure of extremely small dispersion edge regions

In this paper, the investigation of the angular selective windows (ASWs) is realized by constructing multilayer ceramic photonic crystals 1 (MCPC1) containing superconductor films YaBa2Cu3O7 and air layers, MCPC2 composed of dielectrics layers of gallium arsenide ceramic (GaAs), silicon dioxide (SiO2), and aluminium nitride ceramic (AIN), and MCPC3 made up of GaAs and SiO2 films. The epsilon-near-zero (ENZ) properties of the superconductor in MCPC1 and the extremely small dispersion edge regions (DERs) in MCPC2 and MCPC3 provide criteria for angle selection. Organic combinations of three MCPCs can be used to achieve single-channel, dual -channel, three-channel, and four-channel ASWs. At the same time, the applicable working frequency bands for various channels are also studied. In particular, thanks to the lossless ENZ characteristics of YaBa2Cu3O7, ultra-wideband single-channel ASWs of 220-1500 THz can be realized. In addition, the temperature change is also conducive to the control of ASWs position. As far as we know, there are few reports on the channel of ASWs at present, so we hope that the proposed design method will be beneficial to the research of improving the angular device.