A novel dry photopolymer for volume-phase holograms

Improvement of holographic performance by novel photopolymer systems with siloxane-containing epoxides

“…By Kogelnik's coupled wave theory [6], maximum diffraction efficiency for the unslanted transmission hologram is given [7,8] h ¼ sin 2 j j ¼ n p Dn T=½lðn 2 2 sin 2 uÞ 1=2 where h is the maximum diffraction efficiency, n is average refractive index of the recording medium, Dn is the modulation of refractive index, u is an angle within the recording medium between the probe radiation and a line perpendicular to the plane of the medium, T is the film thickness, and l is the recording wavelength.…”

Optical properties of coumarins containing copolymers

“…Due to inherent photo-chemical characteristics, reasonable stability, good solubility and relative ease of synthesis, coumarin derivatives have been extensively investigated for electronic and photonic applications such as charge-transfer agents, solar energy collectors [1] and potential application in organic light-emitting diodes (OLEDs) [2]. They are useful in many fields such as photoalignment of liquid crystalline molecules [3,4], photoactive surface application [5], electroluminescent materials [6], fluorescence materials and laser dyes [7], two photon absorption materials, reversible optical data storage [8,9], organic-inorganic hybrid materials [10], nonlinear optical materials [11], as well as holographic elements [12]. Appropriately substituted coumarins find application as fluorescent dyes for synthetic fibers and as daylight fluorescent pigments, which impart vivid brilliance to paints and printing inks [1].…”

Methacrylate Polymers Having Pendant Chalcone Moieties: Monomer Reactivity Ratios, Thermal and Optical Properties

“…[5][6][7][8] The polymers that contain α, β-unsaturated carbonyl groups (also named chalcone groups) either in the backbone or in pendant position undergo a crosslinking upon irradiation with UV light. These polymers have been used as negative photoresists in printing technology, 9 macro and microlithography, 10 nonlinear optical materials, 11 holographic head-up display, 12 liquid crys-tals, 13 photocrosslinkable paints, 14 tissue engineering, 15 and biosensors. 16 UV radiation curing is a powerful tool in crosslinking heat sensitive polymers rapidly and modify these copolymers' physicochemical characteristics in illuminated areas.…”