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Proceedings Paper

Photochromic polymers for making volume phase holographic gratings: between theory and practice
Author(s): Andrea Bianco; Giorgio Pariani; Chiara Bertarelli; Filippo M. Zerbi
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Paper Abstract

Volume Phase Holographic Gratings (VPHGs) are dispersing elements which are finding wide spread in modern optical instrumentations, also in the astronomical field. Since photochromic materials show a change in the refractive index (Δn) upon photoirradiation, in principle they can be conveniently applied to produce rewritable holographic devices for the near-IR region. Diarylethene-based photochromic films with Δn large enough to meet the basic requirements have been obtained. Photochromic VPHGs have been written by using a custom made holographic set-up, based on a Lloyd's mirror configuration. The efficiency of the photochromic gratings has been measured at different wavelength in the NIR region. A theoretical model to predict the refractive index profile as function of the substrate features has been developed. Finally, the efficiencies calculated by using the RCWA approach have been compared with the experimental values.

Paper Details

Date Published: 20 July 2010
PDF: 8 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77394P (20 July 2010); doi: 10.1117/12.857263
Show Author Affiliations
Andrea Bianco, INAF, Osservatorio Astronomico di Brera (Italy)
Giorgio Pariani, INAF, Osservatorio Astronomico di Brera (Italy)
Politecnico di Milano (Italy)
Chiara Bertarelli, Politecnico di Milano (Italy)
Ctr. for Nano Science and Technology (Italy)
Filippo M. Zerbi, INAF, Osservatorio Astronomico di Brera (Italy)

Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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