Kogelnik-like model for the diffraction efficiency of POLICRYPS gratings

Roberto Caputo, Alessandro Veltri, Cesare Umeton, Andrey V. Sukhov

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

27 Citas (Scopus)


We report on diffraction gratings consisting of continuous and well-aligned nematic films separated by polymer slices, which are originated in nematic-containing polymer composites when cured by a UV interference pattern. The diffraction efficiency of these gratings is experimentally investigated in detail; its temperature dependence reveals a rather complex, nonmonotonic shape, with a next-to-unit maximum at high temperatures and a next-to-zero minimum at lower ones. When the influence of an external electric field is investigated, the dependence of the diffraction efficiency on the applied voltage appears to be nonmonotonic too, the particular shape depending on the actual value of the sample temperature; in general, both switch-on and switch-off of the diffraction mechanism can be observed as an effect of the external field. For this kind of grating, a Kogelnik-like model has been implemented that makes use of only real values of some physical quantities, without the necessity of any fitting parameter. Numerical solutions account for the temperature dependence of the diffraction efficiency with good accuracy.

Idioma originalInglés
Páginas (desde-hasta)735-742
Número de páginas8
PublicaciónJournal of the Optical Society of America B: Optical Physics
EstadoPublicada - abr. 2005
Publicado de forma externa


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