Electrically switchable reflection holograms formed using two-photon photopolymerization

Autor:	S. M. Kirkpatrick, Vincent P. Tondiglia, D.W. Tomlin, Timothy J. Bunning, L. V. Natarajan, D.J. Pikas
Rok vydání:	2002
Předmět:	Diffraction chemistry.chemical_classification Materials science business.industry Holography General Chemistry Polymer Diffraction efficiency law.invention chemistry.chemical_compound Monomer Optics Photopolymer chemistry law Liquid crystal General Materials Science business Excitation
Zdroj:	Applied Physics A: Materials Science & Processing. 74:767-772
ISSN:	1432-0630 0947-8396
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b62903cd144f63fa67ed88194d1af67f https://doi.org/10.1007/s003390100953 Zobrazit plný text záznamu Plný text ve formátu PDF