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Broadband (0.3∼11THz) reflection spectroscopy using terahertz air photonics

Published online by Cambridge University Press:  31 January 2011

Xiaoyu Guo ,
I-Chen Ho  and
Xi-Cheng Zhang
Xiaoyu Guo
Affiliation:
guox@rpi.edu, Rensselaer Polytechinic Inst., Physics, Troy, New York, United States
I-Chen Ho
Affiliation:
hoi2@rpi.edu, Rensselaer Polytechinic Inst., Physics, Troy, New York, United States
Xi-Cheng Zhang
Affiliation:
zhangxc@rpi.edu, Rensselaer Polytechinic Inst., Physics, Troy, New York, United States
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Abstract

Pulsed THz wave spectroscopy using air as the THz wave emitter with the excitation of femtosecond laser provides intense (>100 kV/cm) and broadband THz waves (usable bandwidth from 0.3 to 11 THz). Using the air-biased-coherent-detection (ABCD) method, air can also coherently detect pulsed THz waves over a broadband spectrum. By utilizing these two technologies, we developed a prototype THz air photonics time-domain reflection spectrometer, and applied it on many materials in normal reflection geometry. Optical properties of CaCO3 crystals and several other samples in the THz range were studied. The system provided a signal-to-noise ratio (SNR) over 1000:1, with 0.1 cm−1 frequency resolution. The results acquired from both transmission and reflection measurements were then compared.

Keywords

absorptionlaser-induced reactionoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1163: Symposium K – Materials Research for Terahertz Technology Development , 2009 , 1163-K02-01
Copyright
Copyright © Materials Research Society 2009

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