Abstract
We have developed a local probe technique in order to investigate single quantum confined nanostructures. In our μ-photoluminescence (μ-PL) setup the laser probe is focused on the sample surface by a long working distance microscope objective and the photoluminescence of the sample is collected in backscattering mode by the same objective. Both the optical laser pump and the collected signal are fiber optic coupled, in order to increase the flexibility of the system. A wide range of temperatures (25K–300K) is achieved by means of a closed cycle He-cryostat, modified in order to damp mechanical vibrations and to avoid spatial resolution losses. Photoluminescence maps are provided by a motorized X-Y translation stage, that scans the microscope objective over the sample surface. The overall resolution of the system is of about 600 nm, including the laser focused spot size (λ=514 nm), the cryostat vibrations and the motorized stage resolution. A few selected μ-PL experiments on quantum wires (QWR) and quantum dots (QD) are presented and discussed.
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