Correlation between Dispersivity of Charge Transport and Holographic Response Time in an Organic Photorefractive Glass
| Autor: | M. Grasruck, Peter Strohriegl, Uwe Hofmann, Christoph Hohle, Stefan Schloter, Andreas Schreiber, Stephan J. Zilker, Andre Leopold, and D. Haarer |
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| Rok vydání: | 2000 |
| Předmět: |
Materials science
Molar mass business.industry High-refractive-index polymer Photoconductivity Holography Photorefractive effect Grating Photoelectric effect Surfaces Coatings and Films law.invention Optics law Materials Chemistry Optoelectronics Physical and Theoretical Chemistry business Beam (structure) |
| Zdroj: | The Journal of Physical Chemistry B. 104:3887-3891 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp9935283 |
| Popis: | We report on photoelectric and holographic investigations of an organic photorefractive material based on a low molar mass glass with both photoconductive and nonlinear optical properties. By implementing a suitable plasticizer we obtained a composite system which shows extremely fast initial response times down to 450 μs at writing beam intensities of Iwrite = 10.8 W/cm2 and 2.5 ms at the canonical intensity of Iwrite = 1 W/cm2. Furthermore, high refractive index modulations up to Δn = 6.1 × 10-3, long lifetimes and high optical quality of the samples are observed. In comparison to a second similar composite system, which was plasticized by a more polar dopand, we demonstrate the crucial role of this functional constituent on the photoelectric properties. Time-of-flight measurements show a major impact of the plasticizer on the dispersivity of charge-carrier transport. Subsequently the buildup and decay dynamics of the photorefractive grating are substantially affected. Holographic time-of-flight measure... |
| Databáze: | OpenAIRE |
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