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Real-time Study of the Evolution of Anisotropic Phase Separation in H-PDLC’s

Published online by Cambridge University Press:  15 March 2011

Lalgudi V. Natarajan ,
V.P. Tondiglia ,
R.L. Sutherland ,
D.W. Tomlin  and
Timothy J. Bunning
Lalgudi V. Natarajan
Affiliation:
Science Applications International Corporation, 4031 Colonel Glenn Hwy, Dayton, OH 45431, U.S.A.
V.P. Tondiglia
Affiliation:
Science Applications International Corporation, 4031 Colonel Glenn Hwy, Dayton, OH 45431, U.S.A.
R.L. Sutherland
Affiliation:
Science Applications International Corporation, 4031 Colonel Glenn Hwy, Dayton, OH 45431, U.S.A.
D.W. Tomlin
Affiliation:
Technical Management Concepts, Inc., Dayton, OH 45432.
Timothy J. Bunning
Affiliation:
Air Force Research Laboratory/MLPJ Wright-Patterson Air Force Base, OH 45433-7702, U.S.A.
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Abstract

We have investigated the dynamics of formation of a reflection hologram in a photosensitive formulation containing pre-polymer and liquid crystal. Kogelnik’s two beam coupling theory of an isotropic material has previously been expanded to account for variations of refractive index Δn in the x, y, and z directions. This theory predicts a non-zero p-polarized coupling coefficient, κp at 45o internal angle, only when a macroscopic anisotropy in the grating is present. A broadband source was used as a probe to monitor the diffraction efficiencies (DE) during exposure for both s- and p-polarized light. The onset of a macroscopic ordering of the liquid crystal is observed at the same time as the onset of scattering. We report here the effects of laser writing power on the temporal evolution of s- and p-polarized diffraction efficiency and ppolarized scattered intensity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 709: Symposium CC – Advances in Liquid Crystalline Materials and Technologies , 2001 , CC6.4.1
Copyright
Copyright © Materials Research Society 2002

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References

REFERENCES

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