This talk advertises scattering-type scanning near-field infrared micro-spectroscopy (s-SNIM) in the spectral range of 75 to 1.3 THz , 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 , and local ferroelectric phase-transitions down to LHe . 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  hence achieving an excellent Signal-to-Noise Ratio. Thirdly using the super-radiant TELBE light source , 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.
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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 , and Susanne C. Kehr , "Near-field THz nanoscopy at novel accelerator-based photon sources (Conference Presentation)," Proc. SPIE 10531, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI, 105310E (Presented at SPIE OPTO: January 30, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2289463.5751529139001.
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