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Optics Letters: Improved performance of nanoparticle-polymer composite gratings by thiol doping

Effects of chain-transferring thiol functionalities on the performance of nanoparticle-polymer composite volume gratings

Jinxin Guo, Ryuta Fujii, Takanori Ono, Jürgen Klepp, Christian Pruner, Martin Fally, and Yasuo Tomita

ZrO2 nanoparticle polymer composite holographic grating doped with thiol

Abstract

We report influences of varying functionalities of thiols as chain transfer agents on the spatial frequency response, polymerization shrinkage, and thermal stability of a volume grating recorded in a photopolymerizable ZrO2 nanoparticle-polymer composite film. It is shown that a substantial increase in the saturated refractive index modulation is realized at high spatial frequencies by doping with multifunctional thiols. Moreover, the incorporation of multi-functional thiols considerably suppresses polymerization shrinkage of recorded volume gratings and thermal changes in refractive index and film thickness as compared with the case of mono-thiol. These results indicate that multifunctional thiols provide effective control of the properties of nanoparticle-polymer composite volume gratings for various applications in light and neutron optics. © 2014 Optical Society of America

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