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Proceedings Paper

Near-field THz nanoscopy at novel accelerator-based photon sources (Conference Presentation)
Author(s): Lukas M. Eng; Frederik Kuschewski; Jonathan Döring; Lukas Wehmeier; Thales de Oliveira; Hans-Georg von Ribbeck ; Denny Lang ; Bertram Green ; Sergey Kovalev ; Nilesh Awari ; Stefan F. Winnerl ; Manfred Helm ; Michael Gensch ; Susanne C. Kehr

Paper Abstract

This talk advertises scattering-type scanning near-field infrared micro-spectroscopy (s-SNIM) in the spectral range of 75 to 1.3 THz [1], as provided by the free-electron laser FELBE, the narrow-band laser-light source at Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Germany. We demonstrate the -independent s-SNIM resolution of a few 10 nm by exploring structured Au samples, Graphene-transistors, meta-materials [2], and local ferroelectric phase-transitions down to LHe [3]. s-SNIM secondly was integrated into a THz pump-probe experiment for the inspection of excited states in structured SiGe samples. We developed a novel demodulation technique with high temporal resolution [4] hence achieving an excellent Signal-to-Noise Ratio. Thirdly using the super-radiant TELBE light source [5], HZDR recently extended the wavelength range down to 100 GHz radiation. We adapted our s-SNIM to this TELBE photon-source as well, achieving an equally high spatial resolution as with FELBE. Moreover, the superb 30-fs temporal resolution of TELBE will allow us to study a multitude of physical phenomena with sub-cycle resolution [5,6], such as spin-structures, magnons and phonon polaritons. [1] F. Kuschewski et al., Appl. Phys. Lett. 108 (2016) 113102. [2] S.C. Kehr et al., ACS Photonics 3 (2016) 20. [3] J. Döring et al., Appl. Phys. Lett. 105 (2014) 053109. [4] F. Kuschewski et al., Sci. Rep. 5 (2015) 12582. [5] B. Green et al., Sci. Rep. 6 (2016) 22256. [6] S. Kovalev et al., Struct. Dyn. 4 (2017) 024301.

Paper Details

Date Published: 14 March 2018
Proc. SPIE 10531, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI, 105310E (14 March 2018);
Show Author Affiliations
Lukas M. Eng, TU Dresden (Germany)
Frederik Kuschewski, TU Dresden (Germany)
Jonathan Döring, TU Dresden (Germany)
Lukas Wehmeier, TU Dresden (Germany)
Thales de Oliveira, TU Dresden (Germany)
Hans-Georg von Ribbeck , TU Dresden (Germany)
Denny Lang , Helmholtz-Zentrum Dresden-Rossendorf e. V. (Germany)
Bertram Green , Helmholtz-Zentrum Dresden-Rossendorf e. V. (Germany)
Sergey Kovalev , Helmholtz-Zentrum Dresden-Rossendorf e. V. (Germany)
Nilesh Awari , Helmholtz-Zentrum Dresden-Rossendorf e. V. (Germany)
Stefan F. Winnerl , Helmholtz-Zentrum Dresden-Rossendorf e. V. (Germany)
Manfred Helm , Helmholtz-Zentrum Dresden-Rossendorf e. V. (Germany)
Michael Gensch , Helmholtz-Zentrum Dresden-Rossendorf e. V. (Germany)
Susanne C. Kehr , TU Dresden (Germany)

Published in SPIE Proceedings Vol. 10531:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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