Dynamical behaviour of holographic gratings with a nematic film --Polymer slice sequence structure |
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Authors: | A?Marino Email author" target="_blank">F?VitaEmail author V?Tkachenko R?Caputo C?Umeton A?Veltri G?Abbate |
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Institution: | (1) INFM Unitá di Napoli and Dipartimento di Scienze Fisiche, Universitá di Napoli Federico II, Via Cinthia, 80126 M. S. Angelo, Napoli, Italy;(2) Liquid Crystal Laboratory LICRYL, INFM Unitá di Cosenza CEMIF-CAL, Centro di Eccellenza and Dipartimento di Fisica, Universitá della Calabria, 87036 Arcavacata di Rende (CS), Italy |
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Abstract: | We have studied the dynamical response of a new kind of holographic grating to a pulsed electric field. The structure, named POLICRYPS, consists of a sequence of homogeneous polymer slices separated by liquid-crystal films. We have found that both the rise and fall response times depend on the pulse duration and amplitude of the applied electric field. We propose a phenomenological explanation for this behaviour, outlining the possibility of getting response times of the order of 100
s by properly choosing the pulse shape. Results are very interesting for developments in which POLICRYPS gratings could be proposed as basic elements in photonic devices for telecom applications, and induce to a deeper analysis of the microscopic interaction between liquid crystal and polymer interfaces in these samples.Received: 5 February 2004, Published online: 14 September 2004PACS:
61.30.Pq Microconfined liquid crystals: droplets, cylinders, randomly confined liquid crystals, polymer dispersed liquid crystals, and porous systems - 42.40.Eq Holographic optical elements; holographic gratings - 61.30.Hn Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions |
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