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Effect of space charge field on dynamic and steady-state photorefractive performance in polymeric composites

등록일
2009년 8월 31일 11시 54분 38초
접수번호
1606
발표코드
목4I1심 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
목 14시 : 00분
발표형식
심포지엄
발표분야
고분자화학 - Novel Functional Nanostructures: ㅡ Materials, Structures, Properties and Applications Ⅰ
저자 및
공동저자
김낙중, 오진우, 최칠성
한양대학교 화학과, Korea

Today, polymeric photorefractive (PR) composites are considered to be promising for optical applications such as real-time holography; including optical correlation and real-time image processing, phase conjugation, neural networks, high-density holographic storage, and more. Space charge field (Esc) formation and chromophore reorientation are the crucial processes to perform the photorefractivity, since both the index contrast and the response time of PR grating are closely related with the Esc strength and electro-optic nonlinearity. In particular, the spatially varying charge distribution responsible for Esc formation depends on photoconductivity, including the dynamics of charge generation, transport, trapping, and detrapping in the materials.

In this work, we investigated the influence of key components for PR effect, such as photosensitizer, photoconducting polymer, NLO chromophore, and temperature, on the space charge field formation and discuss the effect of space charge field on the dynamic and steady-state photorefractive performance. At 632.8nm, photo-charge generation efficiencies, photoconductivities, space charge fields, four wave mixing diffraction efficiencies, gain coefficients, and phase shifts were measured as a function of external electric field and temperature. Then, on the basis of experimental results, the relation between the key parameters and the photorefractivity is analyzed and discussed.

 

1. J.-W. Oh, W.-J. Joo, I. K. Moon, C.-S. Choi, and N. Kim, J. Phys. Chem. B. 113, 1592 (2009).

2. C.-S. Choi, I. K. Moon, and N. Kim, Appl. Phys. Lett. 94, 053302 (2009).

3. J.-W. Oh, C. Lee, and N. Kim et. al., J. Chem. Phys. 130, 134909 (2009).

4. J.-W. Oh, I. K. Moon, and N. Kim, J. Photochem. Photobiol. A. 201, 222 (2009).

5. J.-W. Oh, C.-S. Choi, Y. Jung, C. Lee, and N. Kim, J. Mater. Chem. 9, 5765 (2009).

6. I. K. Moon, C.-S. Choi, and N. Kim, J. Pol. Sci. B. 47, 1695 (2009)

7. S. J. Yoon, M. Joo, U.-J. Hwang, and N. Kim, J. Phys. Chem. C., 112, 18592 (2008).


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