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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Ultra‐broadband and high‐dynamic‐range THz time‐domain spectroscopy system based on organic crystal emitter and detector in transmission and reflection geometry
Authors: Puc, Uros
Bach, Tobias
Günter, Peter
Zgonik, Marko
Jazbinsek, Mojca
et. al: No
DOI: 10.1002/adpr.202000098
Published in: Advanced Photonics Research
Volume(Issue): 2
Issue: 4
Page(s): 2000098
Issue Date: 2021
Publisher / Ed. Institution: Wiley
ISSN: 2699-9293
Language: English
Subjects: THz photonics; Terahertz; Spectroscopy; Organic crystal; DSTMS; DAST; Transmission; Reflection
Subject (DDC): 621.3: Electrical, communications, control engineering
Abstract: The terahertz range of the electromagnetic spectrum reveals important insights when studying material properties. An ultra-broadband terahertz time-domain spectroscopy system based on state-of-the-art, high-stability organic nonlinear optical crystals used as both THz wave generator and detector is presented. In transmission geometry, a broad spectrum exceeding 20 THz and a high dynamic range of more than 80 dB is achieved using a compact 100 MHz femtosecond laser working at telecom wavelength 1560 nm. In the normal-incidence reflection geometry, a similar bandwidth with a dynamic range surpassing 60 dB is reported. The experimental results are supported by a complete theoretical model, which includes the pump pulse duration, THz phonon/vibrational modes of the organic crystals and optical/THz beam path optimizations. The effectiveness of the newly developed system is demonstrated by measuring pharmaceutical samples with distinct THz features in the ultra-broadband THz range and by measuring narrow water vapor lines at a spectral resolution of 2.7 GHz (0.090 cm−1), resulting in an excellent accuracy with a frequency deviation of less than 0.05% from the reference values.
Fulltext version: Published version
License (according to publishing contract): CC BY 4.0: Attribution 4.0 International
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Appears in collections:Publikationen School of Engineering

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