Two-photon polymerization initiators for three-dimensional optical data storage and microfabrication

Article Abstract:

Research into a class of pi-conjugated compounds that show large delta and increased two-photon sensitivity compared with ultra-violet initiators indicates that symmetric, donor-substituted conjugated chromophores with large delta and strong electron-donating properties are effective as two-photon-excitable charge-transfer agents. They are also capable of initiating polymerization of acrylate monomers. This research forms the basis for designing chromophores with even higher efficiency for the activation of radical polymerization.

Polymerization

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Electrically switchable mirrors and optical components made from liquid-crystal gels

Article Abstract:

Patterned electrodes in liquid-crystal (LC) display devices can switch molecular orientation within a pixel. Orientation can be reversed by thin layers of material at the cell-plate surface after the electric field is switched off. However, cholesteric LC cells are unable to reorientate back to the initial state and display a scattering texture. A new study investigates the use of crosslinked cholesteric gels to obtain fast electrically switchable reflectors. Such gels could be used for optical components such as lenses.

Polymer liquid crystals, Liquid crystalline polymers, Liquid crystal displays

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Electrically conductive Langmuir-Blodgett films of charge-transfer material

Article Abstract:

Using the Langmuir-Blodgett (LB) technique, thin films of organic charge-transfer (CT) salts can be made in which the organic molecules can be arranged as desired. CT salts show metallic conductivity and superconductivity but the electrical properties of these salts in the form of LB films differ from those of the single crystals. LB films have been successful in electronic devices like Field-effect transistors but the high in-plane conductivity and stability of the films are limited.

Thin films, Multilayered, Multilayered thin films

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