Development of Magnetooptical Plastic Fiber

磁光塑料纤维的研制

• 批准号: 12450265
• 负责人: YAMAZAKI Yohtaro
• 金额: $ 10.69万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450265/
• 关键词: optical plastic fiber; magnetooptical effect; nanoparticle; Bi-YIG; Garnet; 微粒子分散体; BiYIG

This report describes a current sensor using Bi-YIG nanoparticle-dispersed optical prastic fiber with magnetooptical activity. Bi-YIG nanoparticles were prepared by coprecipitation followed by heat treatment. MMA was used for the matrix and PMMA was used for a dispersion agent in the matrix. Both optical absorption coefficient and magnetooptical properties such as saturation Faraday rotation and Veldet constant increased with increasing the volume fraction of the Bi-YIG particle in the fiber. Under the optimized conditions of the fiber length and the volume fraction the Veldet constant, which is the most important parameter for the current sensor, was 10 times as high as rare-earth doped glass. The most preferable wavelength of the optical source was 520 nm.Dispersability of the Bi-YIG particles improves the magnetooptical properties. Two additives for the coprecipitation were tried to improve the dispersibility, in other words, to improve grindability during the milling process. One was NaOH solution, and the other was ammonium sulfate. Adding NaOH solution decreased the crystallization temperature, leading to smaller particles after the milling process. TEM observation revealed that the Bi-YIG particles with the size of 20-40 nm were well dispersed in the case of the coprecipitation using NaOH and ammonium sulfate while coagulations exist in the case of the conventional process. The difference in the dispersibility led to the reduction in the absorption coefficient and the increase in the Faraday rotation. The maximum value of figure of merit reached 4.8, which is twice or higher than the conventional one.

该报告描述了使用带有磁盘活性的Bi-YIG纳米颗粒分散光纤维的电流传感器。通过共沉淀和热处理制备Bi-YIG纳米颗粒。 MMA用于矩阵，PMMA用于基质中的分散剂。随着纤维中Bi-Yig颗粒的体积分数的增加，光吸收系数和磁通状特性（例如饱和法拉第旋转）和Veldet常数都会增加。在纤维长度和体积分数的优化条件下，VELDET常数（对于当前传感器来说是最重要的参数），是稀土掺杂玻璃的10倍。光源最可取的波长是Bi-Yig颗粒的分散性520 nm。试图提高两种用于共沉淀的添加剂，以提高分散性，以改善铣削过程中的研磨性。一种是NaOH溶液，另一种是硫酸铵。添加NaOH溶液降低了结晶温度，导致铣削过程后较小的颗粒。 TEM观察结果表明，在使用NaOH和硫酸铵共沉淀的情况下，在常规过程中存在凝结时，具有20-40 nm大小的Bi-YIG颗粒被很好地分散。分散性的差异导致吸收系数的降低和法拉第旋转的增加。功绩图的最大值达到4.8，比传统的两倍或高。