Analysis of phase patterns in photochromic polyurethanes by a holographic approach
Journal
Date Issued
2015
Author(s)
Abstract
Photochromic polyurethanes based on diarylethene units show a large reversible modulation of refractive index in the Vis-NIR spectral region. The change of refractive index in the material is easily induced by visible laser illumination, without any optical or chemical post-process. In this paper, patterns at the micron scale range have been written by a suitable direct laser writing machine and characterized at 1550 nm by means of a digital holographic approach. The refractive index profile has been retrieved, its dependence on the film thickness and writing speed was shown. The writing process has also been modelled by means of a kinetic model, showing theoretically the dependence of the pattern width and profile on the writing conditions. It is demonstrated that the photochromic films are suitable for developing a reconfigurable platform for complex phase patterns working in the NIR.
Volume
5
Issue
10
Start page
2281
Issn Identifier
2159-3930
Ads BibCode
2015OMExp...5.2281B
Rights
open.access
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