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Cited by 83Terahertz technology and applicationsLiquid Crystal Research AdvancementsSpectroscopy and Laser Applications

Ultrabroadband terahertz spectroscopy of a liquid crystal

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Vieweg, N., Fischer, B. M., Reuter, M., Kula, P., Dabrowski, R., Celik, M. A., Frenking, G., Koch, M., Jepsen, P. U.·2012·Optics Express
DOI 10.1364/oe.20.028249
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Abstract

Liquid crystals (LCs) are becoming increasingly important for applications in the terahertz frequency range. A detailed understanding of the spectroscopic parameters of these materials over a broad frequency range is crucial in order to design customized LC mixtures for improved performance. We present the frequency dependent index of refraction and the absorption coefficients of the nematic liquid crystal 5CB over a frequency range from 0.3 THz to 15 THz using a dispersion-free THz time-domain spectrometer system based on two-color plasma generation and air biased coherent detection (ABCD). We show that the spectra are dominated by multiple strong spectral features mainly at frequencies above 4 THz, originating from intramolecular vibrational modes of the weakly LC molecules.

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  • The orientational order of LCP molecules gives rise to anisotropic properties: the extraordinary refractive index is higher than the ordinary refractive index, and the pulse undergoes a larger time shift for extraordinary polarization.

    “The orientational order of the LCP molecules gives rise to anisotropic properties: The extraordinary refractive index is higher than the ordinary refractive index [38, 39] and consequently, the pulse undergoes a larger time shift in the case of extraordinary polarization.”

    From Terahertz-time domain spectrometer with 90 dB peak dynamic range (2014) · cites this paper as [38]

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Research works printed but not linked: 36

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Authors
Vieweg, N., Fischer, B. M., Reuter, M., Kula, P., Dabrowski, R., Celik, M. A., Frenking, G., Koch, M., & Jepsen, P. U.
Affiliations
  • Philipps University of Marburg (DE)
  • Military University of Technology in Warsaw (PL)
  • Technical University of Denmark (DK)
ORCID
Venue
Optics Express
Publisher
Optica Publishing Group
Published
2012-12-05
Volume
20
Issue
27
Pages
28249
ISSN
1094-4087 (ISSN-L)
DOI
10.1364/oe.20.028249
OpenAlex
W2085325649
Cited by
83
References
37
Citations by year
2026: 2 · 2025: 3 · 2024: 5 · 2023: 5 · 2022: 6 · 2021: 6 · 2020: 6 · 2019: 4 · 2018: 6 · 2017: 6 · 2016: 7 · 2015: 7 · 2014: 8 · 2013: 11
FWCI
5.32
Type
journal article
Language
en
Open access
Licence
Locations
  • Optics Express (publishedVersion)
  • PubMed (publishedVersion)
  • Technical University of Denmark, DTU Orbit (Technical University of Denmark, DTU) (submittedVersion, other-oa)
Funders
  • McGill University
  • Deutscher Akademischer Austauschdienst
Topics
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Liquid Crystal Research Advancements
  • Physical Sciences › Chemistry › Spectroscopy › Spectroscopy and Laser Applications
Keywords
liquid crystals, terahertz spectroscopy, refractive index dispersion, absorption coefficient, intramolecular vibrational modes
MeSH terms
Equipment Design, Refractometry, Equipment Failure Analysis, Liquid Crystals, Terahertz Spectroscopy

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