Equipment

Laser spectroscopy provides direct information regarding the size, composition, band structure, symmetry and carrier dynamics in semiconductor nanostructures. The principle experimental methods utilized in our group are emission laser spectroscopy techniques such as photoluminescence (PL) and electroluminescence (EL) together with absorption methods such as PL-excitation spectroscopy (PLE), direct absorption, photocurrent and reflectivity. In addition, light scattering techniques are used to investigate vibrational and electronic excitations.

In total, we operate four very well equipped laser spectroscopy laboratories that allow us to perform measurements at ultra low temperatures (~500mK) and with extremely high spatial (<1µm) and spectral (<0.1Å) resolution. This is achieved using one of several low temperature confocal microscopes. Optical excitation is provided by femtosecond / picosecond tunable Ti:Sapphire laser systems or using tunable external cavity diode lasers. Our group also makes use of the extensive nanofabrication facilities that exist within the Walter Schottky Institut. If you are interested to collaborate with us or in making measurements in our laboratories please contact Prof. Finley.