Design of an integrated reconfigurable polarization rotator based on right-angle Sb2S3 inlaid in 4H-SiC

A reconfigurable polarization rotator is proposed and demonstrated numerically assisted by a right-angle Sb2S3 inlaid in a slab SiC waveguide. The crystalline Sb₂S₃ enables a 90° polarization rotation with transmittances (T) of -0.22 dB and polarization conversion efficiency (PCE) of 98.36% at the wavelength of 1500 nm. This rotation effect disappears with T > -0.014 dB and PCE < 3.16% within the waveband from 1500 nm to 1600 nm when the Sb₂S₃ is switched to the amorphous state. The reconfigurable polarization rotator can contribute to the programmable photonic integrated circuits and neuromorphic optical computing.