Towards intense THz spectroscopy on water

  • Water is the most prominent solvent. The unique properties of water are rooted in the dynamical hydrogen-bonded network. While TeraHertz (THz) radiation can probe directly the collective molecular network, several open issues remain about the interpretation of these highly anharmonic, coupled bands. In order to address this problem, we need intense THz radiation able to drive the liquid into the nonlinear response regime. Firstly, in this study, we summarize the available brilliant THz sources and compare their emission properties. Secondly, we characterize the THz emission by Gallium Phosphide (GaP), 2–{3–(4–hydroxystyryl)–5,5–dimethylcyclohex–2–enylidene}malononitrile (OH1), and 4–N,N–dimethylamino–4'–N'–methyl–stilbazolium 2,4,6–trimethylbenzenesulfonate (DSTMS) crystals pumped by an amplified near-infrared (NIR) laser with tunable wavelength. We found that both OH1 as well as DSTMS could convert NIR laser radiation between 1200 and 2500 nm into THz radiation with high efficiency \((> 2 × 10^{−4})\), resulting in THz peak fields exceeding 0.1 MV/cm for modest pump excitation (\(~ mJ/cm^{2}\)). DSTMS emits the broadest spectrum, covering the entire bandwidth of our detector from ca. 0.5 to ~7 THz, also at a laser wavelength of 2100 nm. Future improvements will require handling the photothermal damage of these delicate organic crystals, and increasing the THz frequency.

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Metadaten
Author:Fabio NovelliORCiDGND, Biswajit GuchhaitGND, Martina HavenithORCiDGND
URN:urn:nbn:de:hbz:294-74288
DOI:https://doi.org/10.3390/ma13061311
Parent Title (English):Materials
Subtitle (English):characterization of optical rectification by GaP, OH1, and DSTMS at OPA wavelengths
Publisher:MDPI
Place of publication:Basel
Document Type:Article
Language:English
Date of Publication (online):2020/08/12
Date of first Publication:2020/03/13
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Tag:hydration; non-linear optics; solvation; spectroscopy; terahertz; water
Volume:13
Issue:6, Article 1311
First Page:1311-1
Last Page:1311-15
Institutes/Facilities:Lehrstuhl für Physikalische Chemie II, Laserspektroskopie und Biophotonik
open_access (DINI-Set):open_access
Licence (English):License LogoCreative Commons - CC BY 4.0 - Attribution 4.0 International