The aim of this work is to understand the effects of the shrinkage phenomenon in H-PDLC reflection gratings trough the real time analysis of their transmission spectra during the recording process. The real time spectroscopic analysis of the samples showed a light intensity dependent free-radical polymerization indicated by a quick growth of the reflection peak whose corresponding diffraction efficiency, measured at normal incidence, is in the range 40%-45% depending on the photopolymerization conditions. An optical shrinkage corresponding to a 4.3% displacement of the reflected wavelength from the expected value has been detected. This value of the shrinkage is in agreement to that mesaured in similar system.

Optical properties of organic-based periodic structures / Lucchetta, Daniele Eugenio; Vita, Francesco; R., Castagna; Francescangeli, Oriano; Simoni, Francesco. - In: PROGRESS IN BIOMEDICAL OPTICS AND IMAGING. - ISSN 1605-7422. - 6654:(2007), p. 66540M-1.

Optical properties of organic-based periodic structures

LUCCHETTA, Daniele Eugenio;VITA, Francesco;FRANCESCANGELI, ORIANO;SIMONI, Francesco
2007-01-01

Abstract

The aim of this work is to understand the effects of the shrinkage phenomenon in H-PDLC reflection gratings trough the real time analysis of their transmission spectra during the recording process. The real time spectroscopic analysis of the samples showed a light intensity dependent free-radical polymerization indicated by a quick growth of the reflection peak whose corresponding diffraction efficiency, measured at normal incidence, is in the range 40%-45% depending on the photopolymerization conditions. An optical shrinkage corresponding to a 4.3% displacement of the reflected wavelength from the expected value has been detected. This value of the shrinkage is in agreement to that mesaured in similar system.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/36307
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