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Real Time Study of Reflective H-PDLC Gratings

Published online by Cambridge University Press:  10 February 2011

L. V. Natarajan ,
R. L. Sutherland ,
R. T. Pogue ,
V. P. Tondiglia ,
D. Tomlin  and
T. J. Bunning
L. V. Natarajan
Affiliation:
Science Applications International Corporation, 4031, Col.Glenn Hwy, Dayton, OH 45431
R. L. Sutherland
Affiliation:
Science Applications International Corporation, 4031, Col.Glenn Hwy, Dayton, OH 45431
R. T. Pogue
Affiliation:
Science Applications International Corporation, 4031, Col.Glenn Hwy, Dayton, OH 45431
V. P. Tondiglia
Affiliation:
Science Applications International Corporation, 4031, Col.Glenn Hwy, Dayton, OH 45431
D. Tomlin
Affiliation:
TMCI.Inc., Dayton, OH 45432
T. J. Bunning
Affiliation:
Materials and Manufacturing Directorate, AFRL / MLPJ, Wright-Patterson Air Force Base, OH 45433
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Abstract

The formation of holographic reflection gratings in polymer dispersed liquid crystals(H-PDLC) was investigated in real time both in reflection and transmission modes. Real time study is useful for obtaining information on the speed of grating formation, phase separation dynamics, host polymer shrinkage, polarization dependence of the reading beam, bleaching of the photointiator dye and scattering of the writing beam during grating formation. The real time studies showed that the formation of the grating is fast and reaches a maximum in a few seconds. The diffraction efficiency (DE) VS time curve shows an initial increase followed by a sharp decrease and a recovery to higher efficiencies. Variation of monomer functionality in the pre-polymer syrup resulted in a decrease of reflection efficiency as the functionality is lowered. Varying the writing power of the laser beam gave higher efficiencies at powers exceeding 10 mW/cm2. Liquid crystal (LC) loadings of >16% are needed to obtain measurable efficiencies. Varying the polarization of the probe beam (S vs P) revealed differences in the temporal evolution of DE. Morphology studies are indicative of the differences in the phase separation due to monomer functionality, LC concentration and also laser power. The growth dynamics of H-PDLC gratings are very different from the well known Du Pont photopolymer films which may be due to the phase separation process accompanying gelation in H-PDLC systems.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 597: Symposium PP – Thin Films for Optical Waveguide Devices & Materials … , 1999 , 221
Copyright
Copyright © Materials Research Society 2000

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References

1. Chigrinov, V. G., Liquid crystal devices-Physics and applications, Artech House, Boston, 1999, pp 138–49.Google Scholar
2. Schneider, U., Bauerle, R., Leuder, E., Kallfas, T., Ginter, E., and Harjung, R., Proc. Asia Display ‘95’, 95, 27–29(1995).Google Scholar
3. Natarajan, L. V., Sutherland, R., Tondiglia, V., and Bunning, T. J., J. Nonlinear. Opt.Phys.Materl., 5, 89–98(1996).Google Scholar
4. Bowley, C. C., Fontecchio, A. K., Lin, J.J., Yuan, H. and Crawford, G. P., Proc.Materials Research Society, Vol. 559, Pittsburgh, PA, 1999, pp97–107.Google Scholar
5. Bunning, T. J., Natarajan, L. V., Tondiglia, V. P., Sutherland, R. L., Vezie, D. L., and Adams, W.W., Polymer, 36, 2699–3003(1995).Google Scholar
6. Natarajan, L. V., Sutherland, R. L., Tondiglia, V. P., Siweki, S., Pogue, R., Schmitt, M., Brandelik, D., Epling, B., Berman, G., Wendel, C., Ritter, M., and Stallings, M., Proc.Materials Research Society, Vol. 559, pittsburgh, PA, 1999, pp 109–117.Google Scholar
7. Sutherland, R. L., Natarajan, L. V., Tondiglia, V. P., and Bunning, T. J., Chem.Mater., 5, 1533–38(1993).Google Scholar
8. Sutherland, R. L., Natarajan, L. V., Tondiglia, V. P., and Bunning, T. J., Proc. SPIE, Diffractive and Holographic Optics Technology, Eds: I. Cinderich and S. H. Lee, Vol.3010, 142–49(1997).Google Scholar
9. Boots, H. M., Kloosterboer, J. G., Serbutoviez, C., Touwslager, C., Macromoecules, 29, 7683(1996).Google Scholar
10. Sadhir, R. K. and Luck, R. M., Expanding Monomers, CRC Press, Ann Arbor, 1992, pp 1–20.Google Scholar
11. Masso, J. D. and Ning, X., Proceedings SPIE, Vol.2405, 37–55(1995).Google Scholar
12. Pogue, R. T., Natarajan, L. V., Siwecki, S. A., Tondiglia, V. P., Sutherland, R. L. and Bunning, T.J., Polymer, 41, 733–41(2000).Google Scholar