Polymer Concentration Profile near a Liquid-Solid Interface: Evanescent Wave Ellipsometry Study

Curvature oscillations and linear electro-optical effect in a surface layer of a nematic liquid crystal

Damped curvature oscillations are excited at the surface between a nematic liquid crystal and a solid substrate, from the linear coupling of an AC electric field with the flexoelectric properties of the medium. The waves are detected by a modulation ellipsometry technique. Linear-in-field oscillations of the director in the surface nematic layer have been observed. The amplitude and characteris...

Wall-induced orientational order of a liquid crystal in the isotropic phase - an evanescent-wave-ellipsometry study.

Evanescent-wave dynamic light scattering at an oil-water interface: diffusion of interface-adsorbed colloids.

A light-scattering goniometer for evanescent-wave dynamic light scattering (EWDLS) measurements at a liquid-fluid interface is introduced, and used for measurements on two charge-stabilized polystyrene colloid systems adsorbed to alkane-water interfaces. The goniometer allows an independent variation of the penetration depth and the scattering vector components parallel and perpendicular to a l...

Circular and near-circular polarization states of evanescent monochromatic light fields in total internal reflection.

Conditions for the production of near-circular polarization states of the evanescent field present in the rarer medium in total internal reflection of incident monochromatic p-polarized light at a dielectric-dielectric planar interface are determined. Such conditions are satisfied if high-index (>3.2) transparent prism materials (e.g., GaP and Ge) are used at angles of incidence well above the ...

PHASE CORRECTION FOR ULTRASONIC BULK WAVE MEASUREMENTS OF ELASTIC CONSTANTS IN ANISOTROPie

When an ultrasonic wave is incident on a water/solid interface generally three waves are excited in the solid: one longitudinal and two shear. The complex amplitudes of the transmitted waves depend on the material properties and the angle of incidence. At incident angles higher than the first critical angle an evanescent longitudinal wave is excited near the surface. To satisfy the boundary con...