고성능 PVK계 광굴절 고분자 복합체 = High Performance PVK-based Photorefractive Polymer Composite

다국어 초록 (Multilingual Abstract)

A diraction eciency of nearly 100 % with a 100 m thick sample has been reported for acomposite of a hole-transporting polymer, poly (n-vinyl carbazole) (PVK), doped with DMNPAA, ECZ, and TNF. However, there are two drawbacks to this material. One is the short lifetime caused by crystallization. BisCzPro can be used as a plasticizer instead of ECZ to avoid the crystallization. The other issue is the slow response. The photorefractive time constant is typically on the order of 100 ms to seconds at a recording beam intensity of 1 W/cm2 under moderate external electric eld. In this research, by modifying the structure of DMNPAA, we developed new photorefractive polymer composites that have fast response time constants on the order of 10 ms and high diraction eciency . The idea is that if the structure of the NLO is modied to have exible side chains, the NLO becomes much more mobile in an electrical eld without reducing the of large anisotropy in the polarizability. Alkyl groups are substituted in DMNPAA to realize this idea. Rahn et al. reported that the substitution of alkyl can enhance the birerngence of chromophores. We synthesized several new NLOs and measured the response rate of the reorientation and the induced birefringence. We also discuss the inuence of the dispersivity and the glass transition temperature on the rapidity of the reorientation rate in the modied NLOs.

참고문헌 (Reference)

1 L. Solymer, "Thephysics and applications of photorefractive materials" Clarendon Press 1996

2 S. M. Silence et al, "Photorefractive Polymers" IBMResearch Division 265-, newyork

3 Eugene Hecht, "Optics" Addison-Wesley 2002

4 Robert W. Boyd, "Nonlinear Optics" AcademicPress 10-, 1992

5 Pochiyeh, "Introduction to Photorefractive NonlinearOptics" John Wiley & Sons 3-, 1993

6 Bahaa E. A. Saleh, "Fundamentalsof Photonics" John Wiley & Sons 18-, 1991