EFFECT OF THE MAGNETIC FIELD ON OPTICAL ABSORPTION IN LIGHT DEPENDENT RESISTANCE DOPED WITH PHOSPHORS (P) AND IRON (FE) LAYER

This work is devoted to see how the magnetic field effect on the optical absorption in Light Dependent Resistance (LDR) doped with phosphors and iron . This effect is studied at different visible light wave lengths and different (xray) wave lengths. From the results, it is clear that , when one using (x-ray) , and by changing the direction of the magnetic field ,one can tune the resonance photon energy . This variation occurs when one applied high voltages in the (x-ray) tube, thus the magnitude of the absorption coefficient is very sensitive to the direction of the magnetic field. In particular, one can use the direction of the magnetic field as a tunable parameter in optical transitions . In this study the dependence of the inter sub band transitions on the magnetic field is discussed. We show that inter sub band optical absorption is the sensitive to the tilt angle .This behavior in the inter sub band optical absorption gives a new degree of freedom in regions of interest device application. From our results , it’s clear that the sub band energies and inter sub band optical absorption are quite sensitive to the applied magnetic field . The result of this work should provide useful guidance for the design of optically pumped quantum well lasers and quantum well infrared photo detectors.