Frequency selective diffractive optical element (FSDOE)

Abstract

In this research, a novel hybrid lens consisting of a metallic circular symmetry and a diffractive optical element (DOE), whose combined diffraction distribution is very similar to a single DOE, is proposed as an alternative to a hybrid lens consisting of Frequency Selective Surface (FSS) and a DOE. The hybrid lenses are simulated by using optical wave propagation in optical bands and simulated with CST Studio Suite in RF bands. Simulation results are reported for both RF and optical bands. The results indicate that the novel hybrid circularly symmetric lens has almost the same shielding effectiveness (SE) in the RF band compared to the hybrid FSSs. Furthermore, circular symmetry minimizes the spectral components specified in the Abbe-Porter experiment. Consequently, due to the circular symmetry, the combined amplitude distribution of the hybrid lens is close to the amplitude distribution of only one lens. As a result of this research, the proposed hybrid lens will contribute to the development of these structures, entitled FSDOE in this study.