Study on optical-radar frequency division device based on composite dielectric materials

Abstract

In this study, we focus on the design and fabrication of a universal one-dimensional photonic crystal (1DPC) frequency division device (FDD), facilitating the separation of optical and radar signals from various sources. Utilizing the forbidden band characteristics of the one-dimensional heterogeneous photonic crystal (HPC), we engineer multi-layer dielectric films composed of ZnS, YbF₃, and Ge. We employ the transfer matrix technique and the frequency domain superposition principle to effectively reflect visible and mid-infrared light, thereby optimizing the radar transmittance performance of convex and concave lenses to facilitate the transmission of specific wavelength bands. The film is prepared using vacuum coating technology on a uniquely shaped quartz substrate. Experiment results reveal that the device exhibits an average reflectance of 0.986 in the visible region and 0.99 in the mid-infrared region, while the average transmittance efficiency in the Ka (32–39 GHz) band exceeds 0.9.

Keywords

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Tianjin University of Technology