Multistage optical memory of a liquid crystal diffraction grating in a single beam rewriting scheme

Abstract

The authors report on the multistage optical memory of a liquid crystal (LC) diffraction grating fabricated using a dye-dispersed LC/polymer composite medium. Under a single pump beam, the reorientation of dye molecules, confined within spatially periodic interpolymer networks produced by a patterned exposure of ultraviolet light, allows for a pure optic-axis modulation which gives high diffraction efficiency in a planar LC configuration. The resultant multistage optical memory of the LC grating is controlled solely by the polarization state of a single rewriting beam without the use of an erasing step prior to every rewriting process.

Thiol–Ene Click Chemistry

“…Since 2000, hundreds of articles and patent applications, the majority dealing with Norland Optics photoocurable thiol–ene systems, have appeared in a wide array of journals. The applications of this technology are far too extensive to cover in detail in this Review, but apart from those already presented, applications extend to dielectric layers,216, 217 flexible display components,218–225 photonic crystals,226, 227 molding/stamping/imprinting,228–234 grating components,235, 236 lens components,237–240 prism beam stearers,241 optical waveguides,242–245 lithography,246, 247 patterning,248 waveguide cladding,249 nanofiber high‐oxygen‐barrier networks,250 nanopillars,251 microbridges,252 microfluidic devices,253 and plasmonic crystals sensors 254. Probably the largest singe use of Norland thiol–ene‐based photocurable systems has been in the fabrication of PDLCs and HPDLCs and related liquid‐crystalline optical devices 255–291.…”

Block Copolymer Micelles with Near Infrared Metal Phthalocyanine Dyes for Laser Induced Writing

“…Intensity autocorrelation functions, g(2)(t), were recorded at room temperature. The correlation function, g(1)(t) 2 was related by g(2)(t) - 2 with the minimum deviation from the ideal correlation and was plotted as a function of time. Inverse Laplace transformations were performed using the constrained regularization calculation program REPES to obtain the distribution of relaxation times, G(G), where G is the relaxation time.…”

“…Phthalocyanine (Pc) and metallophthalocyanine (M-Pcs) dyes are large macrocyclic molecules that possess unique physicochemical properties and find diverse potential applications such as optical signal recording processes, [1] optical memory systems, [2] liquid crystal displays, [3] optical switches, [4] photovoltaic cells, [5] catalysis in the photooxidation of pollutants, [6] and photodynamic therapy, besides their traditional use in paint formulation [7] and organic floating gate memory transistors. [8] These properties originate from their electronic delocalization, which arises from stacking of the disc-shaped rigid Pc rings as a result of p-p interactions.…”

Thiol‐En‐Klickchemie

“…Eine detaillierte Zusammenfassung dieser Ergebnisse würde den Rahmen dieses Aufsatzes übersteigen. Einige besonders bemerkenswerte Anwendungen der Thiol‐En‐Klickchemie finden sich bei der Herstellung von dielektrischen Schichten,216, 217 flexiblen Displays218–225 und photonischen Kristallen,226, 227 bei Guss‐/Stempel‐/Druckverfahren,228–234 bei der Herstellung von Beugungsgittern,235, 236 optischen Linsen,237–240 Prismen241 und Wellenleitern,242–245 in der Lithographie,246, 247 der Musterbildung248 sowie bei der Herstellung von Wellenleiterverkleidungen,249 Nanofasernetzwerken mit hoher Sauerstoffbarriere,250 Nanosäulen,251 Mikrobrücken,252 mikrofluidischen Bauelemente253 und Sensoren auf der Basis plasmonischer Kristalle 254. Die vermutlich häufigste Verwendung der Norland’schen photohärtenden Thiol‐En‐Systeme ist die Herstellung von PDLCs, HPDLCs und verwandten flüssigkristallinen optischen Bauelementen 255–291.…”