Performance comparison of time-domain terahertz, multi-terahertz, and Fourier transform infrared spectroscopies

0498114 - FZÚ 2019 RIV US eng J - Journal Article
Skoromets, Volodymyr - Němec, Hynek - Goian, Veronica - Kamba, Stanislav - Kužel, Petr
Performance comparison of time-domain terahertz, multi-terahertz, and Fourier transform infrared spectroscopies.
Journal of Infrared, Millimeter and Terahertz Waves. Roč. 39, č. 12 (2018), s. 1249-1263. ISSN 1866-6892. E-ISSN 1866-6906
R&D Projects: GA MŠMT EF16_019/0000760; GA ČR GA17-03662S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : electromagnons * GaAs * THz * FTIR * signal-to-noise ratio * dynamic range
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 1.762, year: 2018

Time-domain terahertz (THz), multi-THz, 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.

Permanent Link: http://hdl.handle.net/11104/0290531