Resonant metal gratings for THz material characterization

Göbel, Thorsten; Schönherr, Daniel; Sydlo, Cezary; Feiginov, M.; Meißner, P.; Hartnagel, H.L.

doi:10.1109/icimw.2007.4516508

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Application Example: Terahertz Spectroscopy Using Subwave1

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2008

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“…Potentially, these structures can be used both as narrow terahertz filters and as material sensors. 15 Ongoing research has indicated that the spectral signatures of Fig. 9 appear redshifted when material layers are attached to the grating.…”

Section: Application Example: Terahertz Spectroscopy Using Subwavementioning

confidence: 96%

Precisely tunable continuous-wave terahertz source with interferometric frequency control

Deninger

Göbel

Schönherr

et al. 2008

Review of Scientific Instruments

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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.

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Section: Application Example: Terahertz Spectroscopy Using Subwavementioning

confidence: 96%