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 (1D) photonic crystal (PhC) frequency division device, facilitating the separation of optical and radar signals from various sources. Utilizing the forbidden band characteristics of the one-dimensional heterogeneous photonic crystal (HPhC), we engineer multi-layer dielectric films composed of ZnS, YbF3, and Ge. We employ the transfer matrix technique (TMM) 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.

Key words:heterogeneous photonic crystal ;Optical-radar frequency division device;composite dielectric materials