Thomas Müller-Wirts

Publications (2)2.1 Total impact

• Article: Single Sampling Point Detection of Frequency Modulated Terahertz Waves

  Maik Scheller, Thomas Kinder, Ole Peters, Thomas Müller-Wirts, Martin Koch
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  ABSTRACT: We present single sampling point detection of the amplitude and phase of frequency modulated continuous wave terahertz radiation. Employing a conventional photomixing setup with a precise wavelength control allows for rapid scan rates in the kHz regime. Two application examples demonstrate the potential of this approach for real time monitoring of samples’ thicknesses and transmittances. KeywordsTerahertz–Photomixing–Frequency modulation–Continuous wave
  Journal of infrared, millimeter and terahertz waves 05/2012; 33(1):36-42. · 0.74 Impact Factor
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  Article: Precisely tunable continuous-wave terahertz source with interferometric frequency control.

  Anselm J Deninger, Thorsten Göbel, Daniel Schönherr, Thomas Kinder, Axel Roggenbuck, Markus Köberle, Frank Lison, Thomas Müller-Wirts, Peter Meissner
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  ABSTRACT: We realized a tunable continuous-wave terahertz source with megahertz frequency resolution. The system is based on optical heterodyning of two near-infrared distributed feedback diode lasers, each laser being stabilized by electronic feedback from a low-finesse quadrature interferometer. The control loop permits precisely linear laser frequency scans over >1200 GHz, and a beat signal linewidth of 1 MHz at 80 ms time scale. Using GaAs photomixers and log-periodic antennae, we achieve a signal-to-noise ratio of the terahertz power of >70 dB at 100 GHz and 100 ms integration time, and still approximately 30 dB at 1 THz. As an example for high-resolution terahertz spectroscopy, we characterize the transmission properties of a subwavelength metal grating.
  Review of Scientific Instruments 05/2008; 79(4):044702. · 1.37 Impact Factor