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Terahertz time-domain spectroscopy of gases, liquids, and solids

: Theuer, M.; Harsha, S.; Molter, D.; Torosyan, G.; Beigang, R.


ChemPhysChem 12 (2011), Nr.15, S.2695-2705
ISSN: 1439-4235
ISSN: 1439-7641
Fraunhofer IPM ()
laser spectroscopy; rotational spectroscopy; sensors; time-resolved spectroscopy; vibrational spectroscopy

The techniques and methods employed in the spectroscopic characterization of gases, liquids, and solids in the terahertz frequency range are reviewed. Terahertz time-domain spectroscopy is applied to address a broadband frequency range between 100 GHz and 5 THz with a sub-10 GHz frequency resolution. The unique spectral absorption features measured can be efficiently used in material identification and sensing. Possibilities and limitations of fundamental and industrial applications are discussed.