Control of emitted light polarization in a 1310 nm dilute nitride spin- Vertical Cavity Surface Emitting Laser subject to circularly-polarized optical injection

We experimentally demonstrate the control of the light polarization emitted by a 1310 nm dilute nitride spin-Vertical Cavity Surface Emitting Laser (VCSEL) at room temperature. This is achieved by means of a combination of polarized optical pumping and polarized optical injection. Without external injection the polarization of the optical pump controls that of the spin-VCSEL. However, the addition of the externally injected signal polarized with either left(LCP) or right-circular polarization (RCP) is able to control the polarization of the spinVCSEL switching it at will to leftor right-circular polarization. A numerical model has been developed showing a very high degree of agreement with the experimental findings.