Correlation between dispersivity of charge transport and holographic response time in an organic photorefractive glass

被引:38
作者
Hofmann, U
Grasruck, M
Leopold, A
Schreiber, A
Schloter, S
Hohle, C
Strohriegl, P
Haarer, D
Zilker, SJ
机构
[1] Univ Bayreuth, Inst Phys, D-95440 Bayreuth, Germany
[2] Univ Bayreuth, BIMF, D-95440 Bayreuth, Germany
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 16期
关键词
D O I
10.1021/jp9935283
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 mu s at writing beam intensities of I-write = 10.8 W/cm(2) and 2.5 ms at the canonical intensity of I-write = 1 W/cm(2). Furthermore, high refractive index modulations up to Delta n = 6.1 x 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 measurements confirm these observations.
引用
收藏
页码:3887 / 3891
页数:5
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