Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 51: Magnetism Poster B
MA 51.4: Poster
Donnerstag, 4. April 2019, 15:00–18:00, Poster C
THz-2D Scanning Spectroscopy — •Finn-Frederik Lietzow1, Yuta Sasaki2, Nina Meyer1, Jakob Walowski1, Christian Denker1, Markus Münzenberg1, and Shigemi Mizukami2 — 1Institut for Physics, University Greifswald, Germany — 2Advanced Institute for Materials Research, Tohoku University, Sendai, Japan
THz radiation has become an increasingly important tool for quality control in the food industry as well as in the medicine sector [1,2]. Since most seald plastic packaging compounds are transparent to THz radiation, it is possible to verify the food or drug ingredients by detecting their absorption lines even without unpacking the investigated substances [1].
We customized a standard commercial THz Fourier Transform spectrometer based on an LT-GaAs Auston switch emitter and detector from Menlo systems by adding a motorized 2D scanning unit. To test this 2D THz spectrocopy scanning system, we investigated a test stripe pattern of Au on glass with decreasing slitwidth and pitch. The measured resolution is very close to the diffraction limit and at 1 THz (300 µm) we can distinguish two points separated by a distance around 338 µm. The next step is to replace the commercial system by a spintronic emitter and a ZnTe detector so that we reach a higher bandwidth.
[1] A. G. Davies et al., Mat. Today 11 (2008) 18.
[2] S. K. Mathanker et al., ASABE 56 (2013).