| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.43 |
| 발표분야 | 분자전자 소재의 현황과 전망 |
| 제목 | Applications of Photorefractive Polymer to Optical Data Processing |
| 초록 | Photorefractive effect refers to a spatial modulation of refractive index of materials which possess both photoconductivity and optical nonlinearity simultaneously. Under the inhomogeneous illumination formed by an interference of two coherent laser beams, a spatially modulating space-charge field is formed due to a redistribution of photocharges, which subsequently modulate refractive index of material via an electro-optic effect. This refractive index modulation is a reversible process which allows applications to dynamic holography. The polymeric photorefractive materials with low glass transition temperature exhibit large refractive index modulations (up to the order of 10-2). These advantages make the organic photorefractive material to become one of the most promising candidates for optical information processing, e.g., real time holography, optically controlled SLM, pattern recognition and fingerprint verification. Figure 1. (a) Master (COPM) and object patterns (P or M) to be correlated. (b) optical correlation results of the master and the object patterns detected in CCD camera. Bright spots are observed at the location where the targets (P or M) match master pattern. (c) intensity distribution of the correlation results. Figure 2. (a) Fingerprint images to be correlated. (b) Optical correlation results of the master and the object patterns detected in CCD camera. (c) Intensity distribution around the correlation peak. |
| 저자 | 김낙중 |
| 소속 | 한양대 |
| 키워드 | organic photorefractive material; real time holography; pattern recognition |
