Circular polarization interferometry: circularly polarized modes of cholesteric liquid crystals.
Opt Express
; 22(25): 31227-36, 2014 Dec 15.
Article
em En
| MEDLINE
| ID: mdl-25607071
ABSTRACT
We describe a novel polarization interferometer which permits the determination of the refractive indices for circularly-polarized light. It is based on a Jamin-Lebedeff interferometer, modified with waveplates, and permits us to experimentally determine the refractive indices nL and nR of the respectively left- and right-circularly polarized modes in a cholesteric liquid crystal. Whereas optical rotation measurements only determine the circular birefringence, i.e. the difference (nL - nR), the interferometer also permits the determination of their absolute values. We report refractive indices of a cholesteric liquid crystal in the region of selective (Bragg) reflection as a function of temperature.
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MEDLINE
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En
Ano de publicação:
2014
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Article