| Autor: |
Tomita, Yasuo, Hata, Eiji, Yasui, Satoru, Mitsube, Ken |
| Zdroj: |
Proceedings of SPIE; May 2011, Vol. 8074 Issue: 1 p80740F-80740F-10, 7993271p |
| Abstrakt: |
We describe an experimental investigation of the photopolymerization kinetics and volume holographic recording characteristics of silica nanoparticle-polymer nanocomposites using thiol-ene monomers capable of step-growth polymerization. We characterize the visible light curing kinetics of a thiol-ene monomer system consisting of secondary dithiol with high self-life stability and low odor and triene with rigid structure and high electron density by using real-time Fourier transform spectroscopy and photocalorimetry. In plane-wave volume holographic recording at a wavelength of 532 nm it is shown that while volume holograms recorded in the nanocomposites exhibit high transparency, their saturated refractive index modulation (nsat) and material sensitivity (S) are as large as 1x10-2and 1615 cm/J, respectively. The polymerization shrinkage is reduced as low as 0.4% as a result of the late gelation in conversion. These values meet the acceptable values for holographic data storage media (i.e., 5x10-3, 500 cm/J and 0.5% for nsat, S and shrinkage, respectively). The improved thermal stability of volume holograms recorded in the nanocomposites is also confirmed experimentally. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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