Solid‐immersion‐lens‐enhanced nanophotoluminescence for spectroscopy of quantum dot systems

Le résumé fourni par la source

We present a novel experimental setup, which introduces a solid-immersion-lens (SIL) into a confocal microphotoluminescence system. This non-destructive method allows us, within a field of view of 35�μm, to reach a spatial resolution of about 200 nm, which is comparable to near-field systems. We demonstrate an enhancement of the collection efficiency by a factor of five in comparison to standard confocal setups. This is very important for single-dot spectroscopy, where the excitation and detection signals are very low. Moreover, we prove that the spatial resolution and collection efficiency of the system are quite insensitive to air gaps which could be formed at the interface between sample and SIL. These two features can be explained with theoretical considerations. For all these reasons, the system is very suitable for the study of single excitonic lines in quantum dots. We show its application in polarization- and temperature-dependent studies.

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