High performance holographic gratings formed with novel photopolymer films containing hyper-branched silsesquioxane

MA Hoque, YH Cho, Y Kawakami - Reactive and Functional Polymers, 2007 - Elsevier
A transparent photopolymer film was prepared by embedding the epoxy cured
octaaminophenylsilsesquioxane (hyper-branched POSS) into poly (vinyl chloride)(PVC) …

Transmission holographic gratings using (siloxane and mesogen)-containing compounds

M He, YH Cho, N Kim, Y Kawakami - Designed monomers and …, 2005 - Taylor & Francis
(Siloxane and mesogen)-containing compounds were found effective in the formation of
holographic gratings, over a wide concentration range from 3 wt% to 30 wt%. A fine grating …

High-performance transmission holographic gratings via different polymerization rates of dipentaerythritol acrylates and siloxane-containing epoxides

YH Cho, CW Shin, N Kim, BK Kim… - Chemistry of …, 2005 - ACS Publications
Well-defined transmission holographic gratings with high diffraction efficiency were
fabricated by irradiating a mixture of photopolymerizable materials with different reaction …

Fabrication of transmission holographic gratings with spiroorthoester and trimethylolpropane triacrylate

Z Li, YH Cho, Y Kawakami - Polymer international, 2007 - Wiley Online Library
Spiroorthoester function was found to be polymerizable with visible laser light (λ= 532 nm) in
the presence of diphenyliodonium hexafluorophosphate and 3, 3′‐carbonylbis (7 …

Improvement of holographic performance by novel photopolymer systems with siloxane-containing epoxides

YH Cho, M He, BK Kim… - Science and Technology of …, 2004 - iopscience.iop.org
Diffraction efficiency and morphology of holographic gratings were improved by combining
ring-opening polymerizable epoxides with radical polymerizable conventional acrylate …

Siloxane‐containing Bifunctional Epoxide Together with Multi‐functional Acrylates to Improve the Performance of Holographic Gratings

Y Kawakami, YH Cho - Macromolecular symposia, 2006 - Wiley Online Library
Well‐defined transmission holographic gratings with high diffraction efficiency were
fabricated by irradiating a mixture of dipentaerythritol penta‐/hexa‐functional acrylates, 1 …

Fast response of the diffraction efficiency in photopolymer prepared by sol–gel process

DH Choi, MJ Cho, H Yoon, H Yoon, JH Kim, SH Paek - Optical Materials, 2004 - Elsevier
New photopolymers were designed and prepared using the functionalized triethoxysilane
via sol–gel process. They were based on organic–inorganic hybrid materials containing …

Holographic gratings in photosensitive acrylic polymers with high refractive index diphenyl sulfide

JH Liu, FT Wu - Journal of Polymer Research, 2004 - Springer
To investigate the effects of polymer matrices on the diffraction efficiency of holographic
grating, a series of chiral compounds of bornyl acrylate (BA), bornyl methacrylate (BMA), and …

A novel process for holographic polymer dispersed liquid crystal system via simultaneous photo-polymerization and siloxane network formation

YH Cho, Y Kawakami - Silicon Chemistry, 2007 - Springer
Formation of transmission holographic polymer dispersed liquid crystal gratings was studied
for matrix components of trimethylolpropane triacrylate: trimethoxysilylmethyl methacrylate: 1 …

Cyclic allylic sulfide based photopolymer for holographic recording showing high refractive index modulation

P Galli, RA Evans, C Bertarelli… - Journal of Polymer …, 2021 - Wiley Online Library
The development and characterization of a new holographic photopolymer system showing
high refractive index modulation (∆ n) is presented. It exploits the ring‐opening …