9 research outputs found
Photoaligned liquid-crystal lens with a single low-voltage electrode
The simple design of liquid-crystal lenses with single electrode and operation
voltage below 5 V is highly desired. We offer a new type of photoaligned liquid-crystal
lens, where the refractive gradient is created by voltage application due to the patterned
twist angle gradient. In this paper, we present our calculations and experimental data
Scattering and birefringence properties of polymeric films modified with nanoparticles of different nature
Scattering properties of directed polyvinyl alcohol films modified with
titanium dioxide or silver nanoparticles and illuminated by a 0.63 μm linear polarized
He-Ne laser radiation were investigated. Ability of the investigated nanomaterials to
depolarize and scatter incident radiation and to form an illumination background close to
diffuse scattering was studied
Structure effect and orientation distribution of azo dyes on optical anisotropy of dyed PVA-films
The derivatives of phenylazobenzoic, phenylazosalicylic acids and
azobenzeneazonaphthalene were synthesized and employed to prepare polarizing films
based on polyvinyl alcohol (PVA). The single-piece transmittance (T0), polarizing
efficiency (PE), dichroic ratio (Rd) of films and order parameter of dyes (Sdye) were
calculated. It was found that parameters Rd and Sdye increased as electron-donating of
substituents in molecules of phenylazobenzoic and phenylazosalicylic acids derivatives
was grown, and the polarizing efficiency of film increased with increasing the order
parameter of dye. Development of PVA films dyed with the derivatives of
phenylazosalicylic acid and azobenzeneazonaphthalene allowed to obtain polarizers for
near UV and visible range of spectrum, respectively. It was also developed a broadband
polarizer for 300-610 nm