Electrically switchable reflection holograms formed using two-photon photopolymerization |
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| Authors: | DJ Pikas SM Kirkpatrick DW Tomlin L Natarajan V Tondiglia TJ Bunning |
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| Institution: | (1) Air Force Research Laboratory, Materials and Manufacturing Directorate/MLPJ, WPAFB, OH 45433, USA, US;(2) Technical Management Concepts, Inc., Beavercreek, OH 45432, USA, US;(3) Science Applications International Corporation, Dayton, OH 45431, USA, US |
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| Abstract: | Two-photon holographic photopolymerization was used to form switchable Bragg gratings composed of layers of phase-separated
liquid-crystal (LC) domains interspersed with cured, crosslinked polymer. These holographic polymer-dispersed liquid crystals
form a periodic structure which diffracts red light due to nanostructured planes ∼250 nm in spacing. These structures were
formed by interfering two 90-fs pulses coherently upon a reactive syrup consisting of acrylate monomer, liquid crystal, and
a two-photon dye. The large two-photon cross-section allows excitation of the two-photon dye that results in electron transfer
between this dye and the monomer. Diffraction efficiencies of approximately 10% were obtained, which can be modulated using
an electric field applied across the film. Switching speeds below 1 ms were observed due in part to the small size of the
LC domains.
Received: 10 April 2001 / Accepted: 1 July 2001 / Published online: 2 October 2001 |
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| Keywords: | PACS: 42 40 PA 82 35 -X 42 70 DF |
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