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Research on optical properties of solid/liquid compounds

固/液化合物光学性质研究

基本信息

批准号：
07650386
负责人：
SAITO Mitsunori
金额：
$ 0.45万
依托单位：
Ryukoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650386/
关键词：
optics compound liquid magnetic fluid liquid crystal microparticle ultrasonic wave porous material アルミナ屈折率

项目摘要

The complex refractive indices of magnetic fluids were evaluated in the wavelength range of 0.6-1.6 mum by measuring the transmission and reflection spectra. The extinction coefficient varies between 0.003 and 0.03 depending upon wavelength. The refractive index varies between 1.6 and 1.7 depending slightly on wavelength. The experimental values agreed well with the theoretical values that were calculated by the effective medium theory. Preliminary experiment of optical switching was demonstrated by utilizing the mobility of the magnetic fluid.Nematic liquid crystals were put into the micropores of anodic alumina films. Molecules of a liquid crystal tend to orient along the axis of columnar pores, since the pore diameter is smaller than 0.2 mum. Accordingly, the refractive index of the liquid crystal varies with the polarization of the light that propagates in the alumina film ; i.e., the ordinary and extraordinary indices correspond to polarizations that are vertical and horizontal to the pores, respectively. The anisotropy in refractive index causes a prominent polarization function due to the index mismatch between a liquid crystal and alumina.In Raman-Nath diffraction by water, the intensities of even-order light beams are selectively enhanced by suspension of microparticles. The diffracted beams remain for several seconds even after the ultrasonic oscillation stops. These phenomena are elucidated by assuming the laminar arrangement of microparticles due to the ultrasonic wave.

通过测量透射和反射光谱，在0.6-1.6 μ m的波长范围内的磁流体的复折射率进行了评估。消光系数根据波长在0.003和0.03之间变化。折射率在1.6和1.7之间变化，略微取决于波长。实验值与有效介质理论计算值吻合较好。利用磁流体的流动性进行了光开关的初步实验，在阳极氧化铝膜的微孔中注入了向列相液晶。液晶的分子倾向于沿着柱状孔的轴取向，因为孔直径小于0.2 μ m。因此，液晶的折射率随着在氧化铝膜中传播的光的偏振而变化;即，寻常折射率和非常折射率分别对应于垂直于孔和水平于孔的偏振。由于液晶和氧化铝之间的折射率失配，液晶折射率的各向异性导致了显著的偏振函数，在水的Raman-Nath衍射中，通过悬浮微粒可以选择性地增强偶数阶光束的强度。即使在超声波振荡停止后，衍射光束仍保持数秒。这些现象通过假设由于超声波的微粒的层状排列来阐明。