You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.
5 January 2004Effect of gel-point versus conversion on the real-time dynamics of holographic polymer-dispersed liquid crystal (HPDLC) formation
We present data that indicates much more uniform reflection grating notches are formed when using thiol-ene photopolymerization as compared to the typical multifunctional acrylate photopolymerization. The scaling behavior of both diffraction efficiency and notch bandwidth versus thickness is presented for both acrylate and thiol-ene-based polymer hosts. The latter follows predicted behavior over a much larger range of thickness than the former. We attribute these differences to a delay in the gel-point with respect to the reaction start. Since the bulk of shrinkage occurs before gelation, detrimental effects caused by anisotropic stress build-up and subsequent relaxation is minimized. Using real-time monitoring techniques, we monitor the blue shift of the notch wavelength and the bandwidth development as a function of time for both chemistries. We demonstrate that thicker samples with appreciable diffraction efficiency and narrow bandwidths can be obtained.
The alert did not successfully save. Please try again later.
Timothy J. Bunning, Lalgudi V. Natarajan, Vincent P. Tondiglia, Richard L. Sutherland, "Effect of gel-point versus conversion on the real-time dynamics of holographic polymer-dispersed liquid crystal (HPDLC) formation," Proc. SPIE 5213, Liquid Crystals VII, (5 January 2004); https://doi.org/10.1117/12.505846