A Space Filter Possessing Polarization Separation Characteristics Realized by 1-D Magnetized Plasma Photonic Crystals

Abstract

In this article, a wide-angle space filter (SF) with absorption function based on 1-D magnetized plasma photonic crystals is proposed, which has a good rectangularity of greater than 0.95. Since the angle range (AR) of the TM polarization is larger than that of the TE, they can be split at specific angles, possessing the potential to be a polarization splitter (PS). The effects of plasma density ne and magnetic induction intensity $B$ on the AR of the SF are discussed based on the tunability of the magnetized plasma. The increase in ne shrinks the AR of TE and TM polarizations at the same time, but that of the TM decreases faster, resulting in a narrower AR of PS. If B is augmented, only the AR of the TM wave will be reduced, which will also lead to the reduction in the AR of the PS. In addition, the impedance matching theory is used to explain the cause of the generation of SF. Compared with the traditional angular filter only with the transmission function, the SF we proposed with the absorption function is relatively rare, and it may have important application possibilities in the antenna field.