Design and performance of reflective terahertz airbiasedcoherentdetection for timedomain.pdf
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Design and performance of reflective terahertz airbiasedcoherentdetection for timedomain
Design and performance of reflective terahertz
air-biased-coherent-detection for time-domain
spectroscopy
I-Chen Ho, Xiaoyu Guo, X.-C. Zhang
Center for Terahertz Research, Rensselaer polytechnic Institute, Troy, NY 12180-3590, USA
*zhangxc@
Abstract: When a sample being tested is optically opaque or has a high
absorption coefficient, a reflective measurement is often more suitable than
a transmission measurement. We report the design and evaluation of a
reflective terahertz time-domain spectroscopy (R-THz-TDS), using air as
THz wave emitter and sensor, together with air-biased-coherent-detection
(ABCD) method for the first time. With an 85 fs pulse amplified laser, we
demonstrate a usable bandwidth from 0.5 THz to 12 THz, together with a
peak dynamic range (DR) better than 2000:1 and a peak THz electrical field
greater than 30 kV/cm. With a 32 fs pulse amplified laser, the usable
bandwidth is remarkably expanded to a continuous 35 THz. Several far-
infrared optical properties in various samples are reported. Furthermore, the
time-resolved optical pump-THz probe experiment is performed. Finally,
the uniqueness and advantage of this spectrometer are comprehensively
compared with traditional THz-TDS and Fourier transform infrared (FTIR)
spectroscopy.
©2010 Optical Society of America
OCIS codes: (190.4380) Nonlinear optics, four-wave mixing; (300.6495) Spectroscopy,
terahertz; (320.0320) Ultrafast op
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