서지주요정보
네마틱 액정과 고분자에서의 광굴절 효과 = Photorefractive effect in liquid crystals and polymers
서명 / 저자 네마틱 액정과 고분자에서의 광굴절 효과 = Photorefractive effect in liquid crystals and polymers / 문준호.
저자명 문준호 ; Mun, Jun-Ho
발행사항 [대전 : 한국과학기술원, 2001].
Online Access 비공개원문

소장정보

등록번호

8012466

소장위치/청구기호

학술문화관(문화관) 보존서고

DPH 01021

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Photorefractive effect has a variety of applications, such as high-density optical data storage, optical image processing, phase conjugated mirrors, dynamic holography and optical computing. It is important to understand two-beam coupling or asymmetric energy exchange behavior to differentiate photorefractive effect from other local effects. Numerical calculaton of wave mixing theory was performed to understand two-wave mixing phenomena in depth using Runge-Kutta method. The behavior of two-wave mixing was examined as functions of incident beam power ratio, gain coefficient, absorption coefficient, and travel distance in codirectional and contra directional cases. The transport and trapping of photocharges in photorefractive liquid crystals sandwiched with photoconductive polymer layers was investigated systematically. The transport process of the photocharges is explained in terms of current paths that are formed along the bright sites of the interference pattern. It was shown that charge trapping occurs predominantly in the photoconductive poly(N-vinylcarbazole) layers, not in the insulating poly(vinyl alcohol) layers, contrary to a previous report. Energy transfer and gain coefficient up to $310cm^{-1}$ were obtained in the liquid crystal systems. Energy exchange between two writing beams in two-wave mixing experiments was observed in polymer systems containing hemicyanine dye. It was found that photobleaching of hemicyanine dyes contributed to forming refractive index gratings in the polymer samples. It was observed that interference pattern on the polymers containing hemicyanine dye and photopolymers slowly shifted with respect to the refractive index grating and long term oscillation of energy exchange took place. The short term competing oscillations of energy transfer in the photopolymers may be attributed to collective pressure-driven mass transport.

서지기타정보

서지기타정보
청구기호 {DPH 01021
형태사항 iii, 154 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jun-Ho Mun
지도교수의 한글표기 : 윤춘섭
지도교수의 영문표기 : Choon-Sup Yoon
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 148-154
주제 광굴절 효과
액정
고분자
이광파 혼합
회절 격자
photorefractive effect
liquid crystal
polymer
two-wave mixing
grating
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