Optical spectroscopy with high spatial resolution (Nanooptics)
Optical spectroscopy with high spatial resolution is a versatile tool to study semiconductor nanostructures especially quantum wires and quantum dots. We pioneered this technique more than 10 years ago by combining confocal microscopy with low temperature spectroscopy as well as near-field optical spectroscopy through metal shadow masks. The main effort in our group is aiming at controlling single excitons, single charges, single spins and single photons in semiconductor quantum dots. Apart from luminescence and luminescence excitation spectroscopy we also study inelastic light scattering from semiconductor nanostructures including electronic as well as phonon excitations. A low temperature microscope stage used for magneto spectroscopy with high spatial resolution and the schematic of a single dot photodiode are shown. This work is supported financially by DFG via SFB631 and by BMBF via nanoQUIT.
