Ultrabroadband terahertz spectroscopy of a liquid crystal.
Opt Express
; 20(27): 28249-56, 2012 Dec 17.
Article
en En
| MEDLINE
| ID: mdl-23263058
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.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Refractometría
/
Cristales Líquidos
/
Espectroscopía de Terahertz
Idioma:
En
Revista:
Opt Express
Asunto de la revista:
OFTALMOLOGIA
Año:
2012
Tipo del documento:
Article
País de afiliación:
Alemania