The spin dependent conductance of mesoscopic device is investigated under the effect of infrared and ultraviolet radiation and magnetic field. This device is modeled as Aharonov-Casher semiconducting ring and a quantum dot is embedded in one arm of the ring. An expression for the conductance is deduced. The results show oscillatory behavior of the conductance. These oscillations might be due to Coulomb blockade effect and the interplay of Rashba spin orbit coupling strength with the induced photons of the electromagnetic field. The present device could find applications in quantum information processing (qubit).