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Project related posters/orals 
Presenter Affiliation Conference Title Link to pdf
C. Maissen NGU 6th EOS Topical Meeting on Terahertz Science & Technology   Synthetic optical holography for phase resolved terahertz nanoimaging at sub-50 nm resolution .... (poster)
C. Maissen NGU Plasmonics and Nanophotonics 2018 Phonon-polariton based nano-split ring resonators .... (poster)
M. Kvapil BUT ICN+T 2018 Brno

Spontaneous silicon substrate oxidation after FIB milling probed by mid-infrared plasmonic antennas .... (abstract) 
V.Křápek BUT Babinet’s principle for disc-shaped plasmonic antennas .... (abstract) 
S. Chen NGU Acoustic graphene plasmon nanoresonators for field enhanced infrared molecular spectroscopy .... (abstract)
C. Maissen NGU The 15th International Conference on Near-Field Optics, Nanophotonics and Related Techniques 

Phonon-polariton based nano-split ring resonator .... (abstract) 
S. Mastel Resonant THz near-field probes .... (abstract) 
A. Govyadinov Probing low-energy hyperbolic polaritons in van der Waals crystals with an electron microscope .... (abstract)   
M. Kern USTUTT Joint European Magnetic Symposia 2018 Integration of molecular quantum bits with semiconductor spintronics .... (abstract) 
M. Kern USTUTT European Conference on Molecular Spintronics 2018 Integration of molecular quantum bits with semiconductor spintronics .... (poster)
V. Křápek BUT DPG 19 Electric, magnetic, and electromagnetic hotspots .... (abstract) 
S. Chen NGU SPP9 Antenna tips for sub-15 nm resolving THz nanoscopy .... (abstract)
J. Čechal BUT ECMM 19 Deposition of molecular magnets by atomic layer injection .... (poster)

Project related diploma theses:

Deposition of Large Organic Molecules in UHV Conditions, Tomáš Krajňák (supervisor: Jan Čechal), BUT 2019

In this thesis, large organic molecules (DM15N, DM18N, Cu(dbm)2) were deposited. These molecules are cannot be deposited by thermal sublimation due the fact that they decompose at lower temperature than they sublime. The employed molecules to single molecular magnets, which can be potentially used as quantum bites (qubit). The new method of deposition atomic layer injection made by Bihur Crystal company was introduced and tested. The method uses liquid solution with molecules which is driven by argon gas through pulse valve to the sample placed in ultra-high vacuum chamber. During the deposition, droplets of solution are formed on the sample surface. The solvent can be removed by light annealing or by keeping the sample in the vacuum for couple of days. The molecules were investigated by x-ray photoelectron spectroscopy and by scanning electron microscopy to determine fragmentation of the molecules, to study topography of the resultant surface and homogeneity of the deposited layer. We found conditions at which the intact molecules are deposited on the sample surfaces and form molecular nano- and micro- crystals.

Project related papers

Understanding the Image Contrast of Material Boundaries in IR Nanoscopy Reaching 5 nm Spatial Resolution, ACS Photonics, 2018, 5 (8), pp 3372-3378, DOI: 10.1021/acsphotonics.8b00636

Stefan Mastel, Alexander A. Govyadinov, Curdin Maissen, Andrey Chuvilin, Andreas Berger, and Rainer Hillenbrand

Abstract: Scattering-type scanning near-field optical microscopy (s-SNOM) allows for nanoscale-resolved Infrared (IR) and Terahertz (THz) imaging, and thus has manifold applications ranging from materials to biosciences. However, a quantitatively accurate understanding of image contrast formation at materials boundaries, and thus spatial resolution is a surprisingly unexplored terrain. Here we introduce the read/write head of a commercial hard disk drive (HDD) as a most suitable test sample for fundamental studies, given its well-defined sharp material boundaries perpendicular to its ultrasmooth surface. We obtain unprecedented and unexpected insights into the s-SNOM image formation process, free of topography-induced contrasts that often mask and artificially modify the pure near-field optical contrast. Across metal-dielectric boundaries, we observe non-point-symmetric line profiles for both IR and THz illumination, which are fully corroborated by numerical simulations. We explain our findings by a sample-dependent confinement and screening of the near fields at the tip apex, which will be of crucial importance for an accurate understanding and proper interpretation of high-resolution s-SNOM images of nanocomposite materials. We also demonstrate that with ultrasharp tungsten tips the apparent width (resolution) of sharp material boundaries can be reduced to about 5 nm.

Job Available: We are looking for a postdoctoral researcher at the Institute of Physical Chemistry of the University of Stuttgart, starting immediately. The initial contract will be for 12 months. The project involves the testing and application of our novel THz EPR microscopy instrument. More information...

We offer: A 12-month contract according to the German TV-L E13 (100%) salary scale; state-of-the-art equipment dedicated to the project; multidisciplinary and vibrant surroundings. We ask: Candidates must have a Ph.D. degree in physics, chemistry, or similar, as well as experience with scanning probe and low-temperature methods. Experience with THz methods is desirable.

Applications by email (slageren@ipc.uni-stuttgart.de), including motivation for application and CV/publication list. The position is open until filled. 

This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 767227.