Magneto-optical mode conversion in Cd1−xMnxTe waveguide on GaAs substrate

Magneto-optical mode conversion was achieved in a waveguide of diluted magnetic semiconductor ${\mathrm{Cd}}_{\text{1−x}}{\mathrm{Mn}}_x\mathrm{Te}$ grown on GaAs substrate. Mode conversion ratio up to 34% under a magnetic field of 5.5 kG was obtained. ${\mathrm{Cd}}_{\text{1−x}}{\mathrm{Mn}}_x\mathrm{Te}$ waveguide showed low optical loss, 4 dB/cm, and high magneto-optical figure-of-merit, 15 deg/dB/kG at $\text{λ=790\hspace{0.05em}}\mathrm{nm}.$ This result shows the feasibility of monolithical integration of an optical isolator with semiconductor optoelectronic devices.