Local-field anisotropy of a light wave in quasi-two-dimensional soft-matter objects
Experimental values of the Lorentz tensor components L{sub j} for uniaxial quasi-two dimensional 'soft matter' objects on substrates (bilayer lipid membranes, multilayer Langmuir films, smectics A, hexatic smectics B, submicron films of discotics Col{sub hd}, micron anisotropic films of liquid-crystal comblike polymers and macromolecular polymers, submicron films of conjugated conductive polymers), freely suspended submicron films of smectics A, and uniaxially stretched micron films of conjugated conductive polymers have been determined using dispersion of refractive indices in the visible range. The dependences of the components L{sub j} on the type of orientation (axial, planar) of uniaxial molecules (structural units of the film) with respect to the optical axis of the film, the film thickness, the substrate type, the chemical structure of molecules, and their long-range orientational order are established. It is revealed that the smectic A-hexatic B phase transition and two-dimensional crystallization of the smectic layer lead to changes in the components L{sub j} due to the change in the orientational ordering of molecules as a result of the relation between the orientational and hexatic order parameters. All the above objects are characterized by isotropization of the Lorentz tensor L and the local-field tensor f with a simultaneous decrease in the birefringence of the sample and in the anisotropy of the molecular polarizability due to the change in the electronic structure of molecules. The correction for the anisotropy of the local-field tensor f to the orientational order parameter or the anisotropy of the molecular polarizability increases. The existing model approaches to calculating the components L{sub j} for the objects under consideration are compared with the experimental data.
- OSTI ID:
- 21443556
- Journal Information:
- Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 4 Vol. 110; ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
BIREFRINGENCE
CORRECTIONS
CRYSTALLIZATION
CRYSTALS
DIMENSIONLESS NUMBERS
DIMENSIONS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
FILMS
FLUIDS
LAYERS
LIPIDS
LIQUID CRYSTALS
LIQUIDS
MEMBRANES
MOLECULES
OPTICAL PROPERTIES
ORDER PARAMETERS
ORGANIC COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POLARIZABILITY
POLYMERS
RADIATIONS
REFRACTION
REFRACTIVE INDEX
SUBSTRATES
TENSORS
THICKNESS
TWO-DIMENSIONAL CALCULATIONS
VISIBLE RADIATION