Journal
APPLIED PHYSICS LETTERS
Volume 108, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4943793
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Funding
- BMBF [05K10ODB]
- Rosa Luxemburg Foundation
- EU-STREP project in FP7 PLAISIR
- German Research Foundation (DFG) through the Cluster of Excellence Center for Advancing Electronics Dresden
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Nano-spectroscopy in the terahertz frequency range remains challenging despite recent technological progress in developing both THz emitter sources and near-field optical microscopy (SNOM). Here, we combine scattering-type SNOM with a free-electron laser light source, to tune into the 1.3-8.5 THz range. A significant portion of this range, namely, the frequencies above similar to 3 THz, is not covered by previously reported near-field microscopy systems. However, it constitutes an indispensable regime where many elementary processes in solids including collective lattice excitations, charge, and spin transport occur. Our approach of nano-spectroscopy and nano-imaging provides a versatile analysis of nanostructures as small as 50 nm, hence beating the optical diffraction limit by k/4600. (C) 2016 AIP Publishing LLC.
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