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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