Performance Comparison of Time-Domain Terahertz, Multi-terahertz, and Fourier Transform Infrared Spectroscopies

Time-domain terahertz (THz), multi-terahertz, and Fourier transform infrared (FTIR) spectroscopies access partly similar and partly complementary spectral ranges of the far-infrared region. We introduce an approach enabling a direct comparison of their performance in terms of the signal-to-noise rat...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2018-12, Vol.39 (12), p.1249-1263
Main Authors: Skoromets, V., Němec, H., Goian, V., Kamba, S., Kužel, P.
Format: Article
Language:English
Subjects:
Black body radiation
Classical Electrodynamics
Configurations
Data points
Electrical Engineering
Electronics and Microelectronics
Engineering
Far infrared radiation
Fourier transforms
Infrared spectroscopy
Instrumentation
Signal to noise ratio
Time domain analysis
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Summary:Time-domain terahertz (THz), multi-terahertz, and Fourier transform infrared (FTIR) spectroscopies access partly similar and partly complementary spectral ranges of the far-infrared region. We introduce an approach enabling a direct comparison of their performance in terms of the signal-to-noise ratio (SNR) and dynamic range (DR), normalized by the time required to obtain one useful data point in the frequency domain. Several configurations of a commercial FTIR spectrometer are compared to our various custom-built time-domain systems (including femtosecond oscillator and amplifier-based THz and multi-THz setups). We find that the normalized SNR of the FTIR systems is generally better than that of the time-domain setups, which is attributed to the noise of the femtosecond laser output compared to the black body radiation source. On the other hand, the coherent detection of the THz field in the time-domain systems leads to a dramatically better normalized DR than in the FTIR configurations.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-018-0544-9