Polarization‐modulated Raman scattering measurements of nematic liquid crystal orientation
作者:
Kelly Huang,
Lynden A. Archer,
Gerald G. Fuller,
期刊:
Review of Scientific Instruments
(AIP Available online 1996)
卷期:
Volume 67,
issue 11
页码: 3924-3930
ISSN:0034-6748
年代: 1996
DOI:10.1063/1.1147293
出版商: AIP
数据来源: AIP
摘要:
This article presents a new, automated Raman scattering experiment to measure the orientation in nematic liquid crystals. The automated experiment utilizes phase modulation to alter the polarization state of light unlike conventional, polarized Raman experiments which require the manual manipulation of polarizers and multiple measurements. Polarization modulation imparts the ability to quantify the second and fourth moments of the orientation distribution function with a single measurement. The feasibility of the new experiment is demonstrated through orientation measure‐ ments of a well characterized nematic liquid crystal, 4‐pentyl‐(4‐cyanophenyl)‐cyclohexane. Additionally, since the results of the polarization‐modulated technique are in excellent agreement with conventional Raman measurements, this study supports the validity of the theory describing Raman scattering from birefringent materials. ©1996 American Institute of Physics.
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