Holographic polymer dispersed liquid crystal (HPDLC) has a feature that can control diffraction of light by
applying electric field. HPDLC can be used for optical elements such as an optical switch, or a polarized beam splitter
etc. One of the reactive systems for making HPDLC is well known photopolymerization-induced phase separation
(PIPS). The performance of HPDLC by PIPS is dependent on distribution of oriented liquid crystal (LC) molecules, or
size and shape of LC droplets. These are controlled by chemical structure or functional group of polymer matrix. In
this report, Organic-inorganic hybrid materials having sensitivity at 532 nm were synthesized. Polymer matrix was
formed with co-polymerization of siloxane-containing materials and poly (propylene glycol) derivatives functionalized
with methacrylate groups. Siloxane chain was introduced in polymer matrix to encourage phase separation of LC and
stabilize grating structure. In addition, poly (propylene glycol) derivatives were designed to control polymerization rate
and extent of phase separation of LC. The characterization of HPDLC was evaluated in terms of diffraction efficiency,
contrast between diffraction and transparency modes by applying voltage, and switch speed. As a result, the separation
ratio of p-polarized light and s-polarized light was 100:1. The value of ▵n was 0.075, and the index matching of both
polymer-rich layer and LC-rich layer was completed at voltage of 17V/μm.
Dai Nippon Printing Co., Ltd. (DNP, Tokyo, Japan) has succeeded in recording Lippmann holograms with an
image of Computer-Generated Holograms (CGHs). As Lippmann holograms are usually made by real
three-dimensional object, design variation of the objects are restricted by the possibility of manufacturing the object.
On the other hand, as CGHs are made by computer graphics (CG), many different kinds of virtual images can be built
into holographic images. Also, it has very fine resolution because it is made by the Electron-Beam lithography system.
By incorporating the image expression of the CGH into Lippmann hologram, we have developed a new hologram
combining both CGHs and the Lippmann holograms.
The quality of a hologram depends on many factors including its resolution, brightness and color reproduction. In a
holographic image, good resolution entails that overt and covert images are clearly visible. However, the effects of using
the H1H2 method to construct holograms, on the resolution of holographic images have not been investigated to date. In
this study, the resolution of images reconstructed from mass-produced color Lippmann holograms using the H1H2
method was evaluated. Silver halide (H1, master hologram) and photopolymer (H2, intermediate and H3 mass-produced
holograms) were used as recording materials. Results indicated that the resolution of H3 images decreased progressively
as noise in H1 images increased. The noise in H1 images was dependent on conditions related to developing the silver
halide and factors related to producing H1. Optimizing the process of creating H1 images was effective in creating high
quality H1H2 holograms.
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