Experimental multi-techniques apparatus for optical properties of quantum structures

An optical setup is specially developed to explore the basic optical properties of quantum wells and other quantum structures. The optical scheme, basically a cross double beam reflectometer, is based on a spectrograph equipped with a linear photodiode array. This arrangement allows an almost simultaneous record of the most relevant spectroscopic features using different techniques like reflectance, photoluminescence, and photoreflectance. Because of unneeded grating repositioning, a direct comparison of absolute positions for structures of spectra taken with different techniques can be made within instrument resolution (Delta E approximate to 0.15 meV @ 800 nm). Successful results by the use of this apparatus for GaAs/InGaAs and AlGaAs/GaAs samples are documented.