Abstract
We have developed a local probe technique in order to realize photoluminescence maps with submicron resolution at temperatures as low as 25 K. To this end a closed cycle He cryostat has been modified in order to damp mechanical vibrations to avoid spatial resolution losses. Both the optical laser pump and the collected signal are fiber-optic coupled. 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 microphotoluminescence (μ-PL) system is ∼500 nm, by considering the contributions of the laser focused spot size (λ=325 nm), the cryostat vibrations, and the motorized stage resolution. The system is described and two low temperature μ-PL experiments on quantum wires and quantum dot nanostructures are presented and discussed.
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