On-chip infrared circular polarization detector with ultrahigh discrimination

Polarization, as a primary physical quantity of light, is of great interest to almost all optical sciences and technologies. Along with linear polarization detection, circular polarization (or light ellipticity) detection is essential for chiral molecule distinguishing, vision dehazing, magnetic field sensing, quantum communication, and cryptography. Traditional solutions rely on external optical systems containing polarizers and wave plates, unfavorably increasing the complexity and sizes of li...