Supramolecular Chiral Structures: Smart Polymer Organization Guided by 2D Polarization Light Patterns

Abstract

Figure 8 . a) Experimental set-up for measuring the polarization dependent diffraction intensities of the OLP hologram. The circularly polarized probe beam is passed through a polarizer (P) in order to vary the angle α of the polarization plane. b) The intensity of the ± x and ± y diffraction orders is reported versus the polarization direction α of the probe beam.

Photoalignment-induced two-dimensional liquid crystal polarization structure via multi-beam polarization interferometry

“…An azobenzene sulfonic dye SD1 (DIC Inc.) is used as the photoalignment material for the interference pattern recording [ Fig. 1(b)] [22,23]. To get a photoalignment layer, the SD1 powder is dissolved in N,N-dimethylformamide (DMF) at a concentration of 1 wt% and spincoated on glass substrate at 3000 rpm for 30 s, which is then soft-baked at 100 °C for 10 min for solvent evaporation, giving a 10 nm-thick solid film.…”

“…However, the intensity modulations of the multi-beam polarization holography could cause either topological relief imposed 2D polarization structure of photo-sensitive polymers [19], or non-complete reorientation of the photosensitive material since null intensity areas existed in the interference field [20]. By introducing relative phases into four interferential CP beams, the intensity modulation could be suppressed, thus a 2D pure polarization microstructures was obtained [21,22]. However, the special relative phase arrangement makes it inappropriate for certain applications, and the usage of polymer makes the grating not tunable by electric field.…”

Thermodynamic properties of liquid-crystalline carbosilane dendrimers of the second and the fourth generation with methoxyphenylbenzoate terminal groups

“…The structure and phase state of different generation LC carbosilane dendrimers with various types of terminal groups are examined in detail at the present time [9][10][11][12]. However the data on thermodynamic properties of liquid-crystalline dendrimers are absent.…”

A Bifunctional Amorphous Polymer Exhibiting Equal Linear and Circular Photoinduced Birefringences

“…[ 17 ] Thereby, the possibility to orient azo-materials in nearly any direction and their light-induced molecular displacement, enables them to be transformed into sophisticated shapes, [ 12 ] providing new opportunities for the fabrication of micro-and nanoarchitectures. [ 18 ] Large and reversible photoinduced linear (LB) and circular birefringences (CB) make azo-materials very attractive for optical data storage and, more particularly, for holographic recording applications, which enable optical devices whose properties strongly depend on the relative values of LB and CB. [ 9 ] The possibility to induce LB and CB in azo-materials by irradiation with properly polarized light has been widely demonstrated, but a CB at least one order of magnitude lower than the linear one is usually observed.…”