Optical Measurements Application Examples
Optical Measurements Application Examples
Automatic Mapping of Semiconductor QDs
Returning to interesting sample positions has never been easier: Yves Delley from the Quantum Photonics Group and co-workers at the ETH Zurich( Switzerland) have built a micro-photoluminescence setup and automated it to a great extent. They programmed a fully automated routine for raster-imaging a full sample of up to 4 x 4 mm 2 as well as implemented an auto-focus routine. Once initiated, the positioners are moved frame by frame and a CCD camera takes images of the PL of their semiconductor quantum dot samples. Knowing the coordinates of all individual images, it is easy to put together a complete map of the sample.
( Image kindly provided by Yves Delley, Quantum Photonics Group, ETH Zurich, Switzerland)
Light-Matter Coupling in TMD Monolayers and Heterostructures
Scanning optical micro-cavities has been used in collaboration between the groups of David Hunger( Karlsruhe Institute of Technology, Germany) and Alexander Högele( Ludwig Maximilian University Munich, Germany) to study light-matter coupling phenomena in semiconductor transition metal dichalcogenide( TMD) monolayers and heterostructures. To this end, suitable positioners- ECSx3030 and ANPx101 positioners for ambient and cryogenic conditions respectively- were used to scan a fiber-based micro-mirror across a planar micro-mirror with the sample and couple a WSe 2 monolayer( MoSe 2
-WSe 2 heterobilayer) to the tuneable cavity.
C. Gebhardt et al., Sci. Rep. 9, 13756( 2019) M. Frög et al., Nature Commun. 10, 3697( 2019)( Image courtesy of Christoph Hohmann, NIM and MCQST, Munich, Germany)
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