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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 17, Iss. 3 — Mar. 1, 2000
  • pp: 452–461

Influence of noise on the characterization of materials by terahertz time-domain spectroscopy

Lionel Duvillaret, Frédéric Garet, and Jean-Louis Coutaz  »View Author Affiliations


JOSA B, Vol. 17, Issue 3, pp. 452-461 (2000)
http://dx.doi.org/10.1364/JOSAB.17.000452


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Abstract

We analyze the contributions of various error sources to uncertainty in the far-infrared optical constants (refractive index and absorption coefficient) measured by terahertz (THz) time-domain spectroscopy. We focus our study on the influence of noise. This noise study is made with a thick slab of transparent material for which the THz transmitted signal exhibits temporal echoes owing to reflections in the sample. Extracting data from each of these time-windowed echoes allows us to characterize the noise sources. In THz time-domain spectroscopy experiments in which photoswitches are used as antennae, the transmitting antenna constitutes the principal noise source. The uncertainty in the far-infrared optical constants can be strongly reduced when the extraction is performed with THz echoes that have encountered many reflections in the sample.

© 2000 Optical Society of America

OCIS Codes
(120.4530) Instrumentation, measurement, and metrology : Optical constants
(300.6240) Spectroscopy : Spectroscopy, coherent transient

Citation
Lionel Duvillaret, Frédéric Garet, and Jean-Louis Coutaz, "Influence of noise on the characterization of materials by terahertz time-domain spectroscopy," J. Opt. Soc. Am. B 17, 452-461 (2000)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-17-3-452

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