EXPERIMENTAL MULTI-TECHNIQUES APPARATUS FOR OPTICAL-PROPERTIES OF QUANTUM STRUCTURES

An optical setup is specially developed to explore the basic optical p roperties of quantum wells and other quantum structures. The optical s cheme, basically a cross double beam reflectometer, is based on a spec trograph equipped with a linear photodiode array. This arrangement all ows an almost simultaneous record of the most relevant spectroscopic f eatures using different techniques like reflectance, photoluminescence , and photoreflectance. Because of unneeded grating repositioning, a d irect comparison of absolute positions for structures of spectra taken with different techniques can be made within instrument resolution (D elta E approximate to 0.15 meV @ 800 nm). Successful results by the us e of this apparatus for GaAs/InGaAs and AlGaAs/GaAs samples are docume nted.