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Step-scan time-domain terahertz magneto-spectroscopy

: Molter, D.; Torosyan, G.; Ballon, G.; Drigo, L.; Beigang, R.; Leotin, J.

Postprint (1.5 MByte; PDF; )

Optics Express 20 (2012), Nr.6, S.5993-6002
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IPM ()
terahertz spectroscopy; magneto-optic systems

We present a novel approach for terahertz time-domain spectroscopy of magneto-optic phenomena. The setup used in this work combines a tabletop pulsed magnet and a standard terahertz time-domain spectroscopy system. The approach is based on repetitive operation of the pulsed magnet and step-wise increment of the delay time of the time-domain spectroscopy system. The method is demonstrated by plotting the magneto-transmission spectra of linearly polarized THz pulses through the hole gas of a Ge sample and the electron gas of GaAs, InSb and InAs samples. Cyclotron resonance spectra are displayed in the frequency range from 200 GHz to 2 THz and for a magnetic field up to 6 T. The GaAs spectra are analyzed in more detail using simulations based on the Drude model.