Volume phase holographic elements are becoming attractive thanks to the large efficiency and good optical quality. They are based on photosensitive materials where a modulation of the refractive index is induced. In this paper, we highlight the strategies to obtain a change in the refractive index in a dielectric material, namely a change in the material density and/or in the molecular polarizability. Moreover, we show the results achieved for materials that undergo the photo-Fries reaction as function of the molecular structure and the illumination conditions. We also report the results on a system based on the diazo Meldrum’s acid where volatile molecules are produced upon light exposure.
Andrea Bianco, Letizia Colella, Paola Galli, Alessio Zanutta, and Chiara Bertarelli, "New photosensitive systems for volume phase holography," Proc. SPIE 10233, Holography: Advances and Modern Trends V, 102330L (Presented at SPIE Optics + Optoelectronics: April 25, 2017; Published: 31 May 2017); https://doi.org/10.1117/12.2264908.
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