中国物理B ›› 2002, Vol. 11 ›› Issue (1): 21-29.doi: 10.1088/1009-1963/11/1/306

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Influence of intensity on the steady and transient state space-charge fields in photorefractive polymers

袁保红, 孙秀冬, 姜永远, 周忠祥, 姚凤凤, 李焱   

  1. Department of Applied Physics, Harbin Institute of Technology, Harbin 150001, China
  • 收稿日期:2001-03-08 修回日期:2001-08-28 出版日期:2005-06-12 发布日期:2005-06-12
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 69878006), and the Foundation of Harbin Institute of Technology, China (Grant No. 991190-014).

Influence of intensity on the steady and transient state space-charge fields in photorefractive polymers

Yuan Bao-Hong (袁保红), Sun Xiu-Dong (孙秀冬), Jiang Yong-Yuan (姜永远), Zhou Zhong-Xiang (周忠祥), Yao Feng-Feng (姚凤凤), Li Yan (李焱)   

  1. Department of Applied Physics, Harbin Institute of Technology, Harbin 150001, China
  • Received:2001-03-08 Revised:2001-08-28 Online:2005-06-12 Published:2005-06-12
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 69878006), and the Foundation of Harbin Institute of Technology, China (Grant No. 991190-014).

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摘要： We have proven theoretically that there are sublinear, linear and superlinear relations between the response rates and total incident intensity for different cases of traps in photorefractive polymer materials. These relations were observed in inorganic photorefractive crystals many years ago. Also, the steady-state space-charge field is a function of the total incident intensity, which has also been found in inorganic photorefractive crystals. We have measured the relations of the steady-state diffraction efficiency and the response rate with respect to the total incident intensity in the photorefractive composite consisting of the polymer (N-vinylcarbazole) (PVK) doped with 4,4'-n-pentylcyanobiphenyl (5CB) and C60. The results obtained show that the composite belongs to the case of low trap density.

Abstract: We have proven theoretically that there are sublinear, linear and superlinear relations between the response rates and total incident intensity for different cases of traps in photorefractive polymer materials. These relations were observed in inorganic photorefractive crystals many years ago. Also, the steady-state space-charge field is a function of the total incident intensity, which has also been found in inorganic photorefractive crystals. We have measured the relations of the steady-state diffraction efficiency and the response rate with respect to the total incident intensity in the photorefractive composite consisting of the polymer (N-vinylcarbazole) (PVK) doped with 4,4'-n-pentylcyanobiphenyl (5CB) and C60. The results obtained show that the composite belongs to the case of low trap density.

Key words: photorefractive polymer, space-charge field, response rate

中图分类号:  (Light-sensitive materials)

  • 42.70.Gi
42.70.Jk (Polymers and organics)