Hosted By: Quantum Optical Science and Technology Technical Group
31 March 2021, 12:00 - 13:00
- Eastern Daylight Time (UTC - 04:00)
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Scanning probe microscopy (SPM) traditionally employs a sharp tip as a sensor. This geometry is a problem for many modern near-field probes, such as NV centers in diamond, which cannot easily be placed on a tip.
In this webinar hosted by the OSA Quantum Optical Science and Technology Technical Group, Friedemann Reinhardt from Technical University Munich will present a novel, tipless approach - a technique to scan a planar probe parallel to a planar sample at a distance of few tens of nanometers.
The core of this scheme are optical far-field techniques to measure both distance and tilt between the probe and the sample with sub-nm and sub-mrad precision. These measurements are employed as a feedback signal for positioning. Using this scheme, Reinhardt demonstrates scanning near-field optical microscopy (SNOM) of plasmonic modes in silver nanowires using shallow NV centers in a bulk diamond. Reinhardt will equally present ongoing experiments to implement a scanning nanogap cavity and to perform magnetic imaging at the nanoscale.
S. Ernst et al., ACS Photonics 6, 327 (2019)
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Friedemann Reinhard is heading an independent Emmy Noether research group at the Technical University of Munich (Germany). He received a diploma degree in Physics from the University of Göttingen, and a PhD degree from Université Paris VI (Pierre et Marie Curie) for work on atomic clocks. He subsequently shifted his research to NV centers in diamond and their application as quantum sensors, joining the laboratory of Jörg Wrachtrup at the University of Stuttgart. Since 2014 he has been heading an independent laboratory at the Technical University of Munich. The focus of his group is nanoscale magnetic resonance imaging, using NV centers in diamond as detectors for small ensembles of electron and nuclear spins. The group has also pioneered several improved readout schemes for NV centers, and has invented the planar scanning probe microscope.