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Optics Letters

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  • Vol. 36, Iss. 17 — Sep. 1, 2011
  • pp: 3308–3310

Self-referenced method for terahertz wave time-domain spectroscopy

Albert Redo-Sanchez and Xi-Cheng Zhang  »View Author Affiliations


Optics Letters, Vol. 36, Issue 17, pp. 3308-3310 (2011)
http://dx.doi.org/10.1364/OL.36.003308


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Abstract

The method allows retrieval of the absorbance of a sample without the need for a reference measurement. The method measures the dynamic variation of frequency resolution as the waveform is being acquired. In terahertz wave time-domain spectroscopy, the frequency resolution increases as the temporal window increases. Therefore, narrow absorption peaks will appear in the spectrum when the temporal window is long enough to resolve the peak. By measuring the dynamic values of each frequency component at specific points in time, a reference value and a peak value are extracted and, hence, the self-referenced is achieved. In addition, the method provides a mechanism to remove the effects of echoes, which enables arbitrary temporal window length and, thus, achieves high-resolution frequency. Examples of extraction of the water vapor lines and resonant features in gas and semiconductors are demonstrated in transmission and reflection geometries.

© 2011 Optical Society of America

OCIS Codes
(300.0300) Spectroscopy : Spectroscopy
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Spectroscopy

History
Original Manuscript: June 17, 2011
Revised Manuscript: July 12, 2011
Manuscript Accepted: July 22, 2011
Published: August 17, 2011

Citation
Albert Redo-Sanchez and Xi-Cheng Zhang, "Self-referenced method for terahertz wave time-domain spectroscopy," Opt. Lett. 36, 3308-3310 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-17-3308


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