In this paper we report a detailed characterization of a new structure (POLICRYPS) in which liquid crystal films are completely separated by polymer slices. This structure behaves as a Bragg diffraction grating and exhibits efficiencies that can become as high as 96-98%. The temperature dependence of the diffraction efficiency can be explained in terms of a Kogelnik-like model. A numerical simulation has been implemented which makes use only of real values of physical quantities and accounts for the experimental results with good accuracy. An applied electric field is able to switch off the grating, with a characteristic switching time which is lower than 1 ms. Threshold values of the field vary in the range 3-5 V/μm for gratings with a 1.39 μm fringe spacing.

Realization of POLICRYPS gratings. Optical and electro-optical properties / Caputo, R.; De Sio, L.; Veltri, A.; Umeton, C.; Sukhov, A. V.. - In: MOLECULAR CRYSTALS AND LIQUID CRYSTALS. - ISSN 1542-1406. - STAMPA. - 441:1(2005), pp. 111-129. [10.1080/154214091009590]

Realization of POLICRYPS gratings. Optical and electro-optical properties

De Sio, L.;
2005

Abstract

In this paper we report a detailed characterization of a new structure (POLICRYPS) in which liquid crystal films are completely separated by polymer slices. This structure behaves as a Bragg diffraction grating and exhibits efficiencies that can become as high as 96-98%. The temperature dependence of the diffraction efficiency can be explained in terms of a Kogelnik-like model. A numerical simulation has been implemented which makes use only of real values of physical quantities and accounts for the experimental results with good accuracy. An applied electric field is able to switch off the grating, with a characteristic switching time which is lower than 1 ms. Threshold values of the field vary in the range 3-5 V/μm for gratings with a 1.39 μm fringe spacing.
2005
diffraction gratings; liquid crystals; optical switches; polymers; chemistry (all); materials science (all); condensed matter physics
01 Pubblicazione su rivista::01a Articolo in rivista
Realization of POLICRYPS gratings. Optical and electro-optical properties / Caputo, R.; De Sio, L.; Veltri, A.; Umeton, C.; Sukhov, A. V.. - In: MOLECULAR CRYSTALS AND LIQUID CRYSTALS. - ISSN 1542-1406. - STAMPA. - 441:1(2005), pp. 111-129. [10.1080/154214091009590]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1113182
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