Far‐Infrared and Low‐Frequency Raman Spectra of Condensed Media

Perova, Tatiana S.

doi:10.1002/9780470141465.ch5

Cited by 18 publications

(2 citation statements)

References 80 publications

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“…Cyanobiphenyls, such as 5CB and 7CB, are major components of E7. 5CB is known to have broad absorption features near 100, 140, and 165 cm −1 , i.e., ϳ3-6 THz to [31]. In particular, there is a broad shoulder extending from the sub-terahertz frequencies to the absorption band near ϳ100 cm −1 assigned to the libration of the rigid molecule around its long axis.…”

Section: A Complex Optical Constantsmentioning

confidence: 99%

The complex refractive indices of the liquid crystal mixture E7 in the terahertz frequency range

et al. 2010

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We have used terahertz time-domain spectroscopy to investigate the complex optical constants and birefringence of a widely used liquid crystal mixture E7 in both nematic and isotropic phases ͑26°C-70°C͒. The extinction coefficient of E7 at room temperature is less than 0.035 and without sharp absorption features in the frequency range of 0.2-2.0 THz. The extraordinary ͑n e ͒ and ordinary ͑n o ͒ indices of refraction at 26°C are 1.690-1.704 and 1.557-1.581, respectively, giving rise to a birefringence of 0.130-0.148 in this frequency range. The temperature-dependent ͑26°C-70°C͒ order parameter extracted from the birefringence data agrees with that in the visible region quite well. Further, the temperature gradients of the terahertz optical constants of E7 are also determined. The optical constants of E7 in the terahertz or sub-millimeter wave range are found to deviate significantly from values predicated by the usual extended Cauchy equations used in the visible and near-infrared.

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Section: A Complex Optical Constantsmentioning

confidence: 99%

The complex refractive indices of the liquid crystal mixture E7 in the terahertz frequency range

et al. 2010

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“…A relatively new but remarkably fast growing research topic is the investigation and characterization of the terahertz (THz) spectral properties of liquid crystals (LCs) [1][2][3][4][5][6][7][8][9][10]. These studies are spurred by an increased demand for new fast and cost-efficient switchable devices [11], to manipulate the THz radiation for various applications [12][13][14] including THz communication [15,16].…”

Section: Introductionmentioning

confidence: 99%

Ultrabroadband terahertz spectroscopy of a liquid crystal

Vieweg¹,

Fischer²,

Reuter³

et al. 2012

Opt. Express

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Publication date: 2012 Document VersionPublisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Vieweg, N., Fischer, B. M., Reuter, M., Kula, P., Dabrowski, R., Celik, M. A., ... Jepsen, P. U. (2012). Ultrabroadband terahertz spectroscopy of a liquid crystal. Optics Express, 20(27) 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 timedomain 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. A 38(6), 3098-3100 (1988). 36. J. P. Perdew, "Density-functional approximation for the correlation energy of the inhomogeneous electron gas," Phys. Rev. B 33, 8822-8824, Erratum: B 34, 7406 (1986). 37. A. Schäfer, H. Horn, and R. Ahlrichs, "Fully optimized contracted Gaussian basis sets for atoms Li to Kr," J.

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Rotational Diffusion and Dielectric Relaxation in Nematic Liquid Crystals

Coffey¹,

Kalmykov²

2000

Advances in Chemical Physics

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Far‐Infrared and Low‐Frequency Raman Spectra of Condensed Media

Cited by 18 publications

References 80 publications

The complex refractive indices of the liquid crystal mixture E7 in the terahertz frequency range

The complex refractive indices of the liquid crystal mixture E7 in the terahertz frequency range

Ultrabroadband terahertz spectroscopy of a liquid crystal

Rotational Diffusion and Dielectric Relaxation in Nematic Liquid Crystals

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