An important task in controlling signal reception, transmission, and processing in photonic integrated circuits is to make a specific EM waveform, which is done with polarization convertors. Today, various waveguide structures based on the effects of birefringence and dichroism are used as polarization controllers that control the electromagnetic waveform. This paper presents the structures of symmetric and asymmetric ridge waveguides that allow polarization control based on the birefringence effect; and the waveguide structure with an asymmetrically arranged metal film that allows polarization control based on the plasmon effect; and also the structure of a dichroic circular polarizer based on nanostructures.
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