Magneto optical rotation in a GaAs Quantum Well Waveguide

TL;DR

This paper demonstrates how a GaAs quantum well waveguide can exhibit significant magneto-optical rotation by applying a magnetic field, with the rotation controllable through field intensity and waveguide length.

Contribution

It introduces a method to induce and control magneto-optical rotation in a GaAs quantum well waveguide using a static magnetic field.

Findings

Magnetic field induces birefringence in the QW waveguide.

Dephasing rate affects the medium's dichromatic properties.

Adjusting magnetic field and waveguide length controls the rotation.

Abstract

The interaction of two orthogonally polarized beams and a four-level GaAs quantum well (QW) waveguide is investigated. It is shown that, by applying a static magnetic field normal to the propagation direction of the driving beams, the birefringence can be induced in the QW waveguide. Moreover, it is demonstrated that the dephasing rate between two ground states of the QW waveguide makes it a dichromatic medium and can also diminish the induced birefringence. Our results show how a large and complete magneto-optical rotation in the QW waveguide can be obtained via adjusting the intensity of the magnetic field and also the length of the QW waveguide.