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Development of Optical Recording System Based on the Local-Field Control

基于局域场控制的光记录系统的研制

基本信息

批准号：
05555006
负责人：
MIYANO Kenjiro
金额：
$ 6.78万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

项目摘要

The optical recording involving the organic dyes is usually based on the spectral change of the dye molecule itself, e.g., photochromism under photo-isomerization. Therefore, the design and synthesis of the dye molecule is of prime importance which could be a hard task. The purpose of the current study is to understand the effect of the local field on the spectrum of a dye molecule and use it for the opptical recording instead. The project is devided into two parts ; one for understanding the local field both experimentally and theoretically and two for demonstrating the effect.1.Sample Preparation : The Langmuir-Blodgett (LB) techniques are mainly used along with the vacuum deposition. A novel LB method without using a spreading solvent has been developed for the indissoluble molecules.2.Local-Field Measurement : The second-harmonic generation (SHG) dfficiency is used to evaluate the local-field contribution to the dye spectrum. The electroabsorption is measured to estimate the local-field factor in gerroelectric polymers.3.Theory : A simple molecular layr model is used to interprete the experimental data in Sec.2.The J-aggregate of dyes has been taken as a model system with the extremely strong local field. The successful reproduction of the absorption, emission, and the resonance Rayleigh scattering spectra shows that our model is realistic.4.Demonstration : Layred structures of ferroelectric polymers and dyes are fabricated using the LB technique. The absorption change of a few % driven by the remanent field can be seasily observed.

涉及有机染料的光学记录通常基于染料分子本身的光谱变化，例如光异构化下的光致变色。因此，染料分子的设计和合成至关重要，这可能是一项艰巨的任务。当前研究的目的是了解局部场对染料分子光谱的影响，并将其用于光学记录。该项目分为两部分；一个用于从实验和理论上了解局部场，两个用于演示效果。1.样品制备：Langmuir-Blodgett (LB) 技术主要与真空沉积一起使用。针对不溶性分子，开发了一种不使用扩散溶剂的新型LB方法。2.局域场测量：二次谐波发生（SHG）效率用于评估局域场对染料光谱的贡献。通过测量电吸收来估计介电聚合物中的局域场因子。3.理论：使用简单的分子层模型来解释第2节中的实验数据。染料的J聚集体被视为具有极强局域场的模型系统。吸收、发射和共振瑞利散射光谱的成功再现表明我们的模型是现实的。4.演示：使用LB技术制造铁电聚合物和染料的层状结构。可以轻松观察到由剩余场驱动的百分之几的吸收变化。