TY  - JOUR
AU  - Vieweg, N.
AU  - Jansen, C.
AU  - Shakfa, M.K.
AU  - Scheller, M.
AU  - Krumbholz, N.
AU  - Wilk, R.
AU  - Mikulics, M.
AU  - Koch, M.
TI  - Molecular properties of liquid crystals in the terahertz frequency range
JO  - Optics express
VL  - 18
SN  - 1094-4087
CY  - Washington, DC
PB  - Soc.
M1  - PreJuSER-9012
SP  - 6097 - 6107
PY  - 2010
N1  - Record converted from VDB: 12.11.2012
AB  - We report on a first experimental study of the molecular properties of nematic liquid crystals in the terahertz range. In the beginning, we extract the frequency and temperature dependent refractive index and absorption coefficient of the cyanobiphenyls 5CB, 6CB and 7CB from terahertz time domain spectroscopy measurements and investigate the impact of the alkyl chain length on the macroscopic liquid crystal characteristics, focusing especially on the pronounced odd and even effect. Next, we deduce the principle polarizabilities and the order parameter S by applying Vuks' approximation and Haller's approach. On this basis, we calculate the main polarizabilities along the longitudinal and transverse axis and link the observed terahertz properties to the molecular structure of the liquid crystals.
KW  - Computer Simulation
KW  - Light
KW  - Liquid Crystals: chemistry
KW  - Models, Chemical
KW  - Refractometry
KW  - Scattering, Radiation
KW  - Terahertz Radiation
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
C6  - pmid:20389631
UR  - <Go to ISI:>//WOS:000276002500081
DO  - DOI:10.1364/OE.18.006097
UR  - https://juser.fz-juelich.de/record/9012
ER  -