Simultaneous identification of the low-field-induced tiny variation of complex refractive index for anisotropic and opaque magnetic-fluid thin film by a stable heterodyne Mach-Zehnder interferometer.
We use a heterodyne Mach-Zehnder interferometer to simultaneously and simply measure the complex refractive index by only normal incidence on the specimen, instead of using a complicated measurement procedure or instrument that only measures the real or imaginary part of the complex refractive index. To study the tiny variation of the complex refractive index, the small complex refractive-index variation of a rare-concentration magnetic-fluid thin film, due to a weak field of less than 200 Oe, was processed by this interferometer. We also present the wavelength trend of the complex refractive index of magnetic fluids to verify the appearance of the slight change in a small wavelength range.
Hong
Chin-Yih
CY
1Graduate Institute of Biomedical Engineering, National Chung Hsing University, Taichung 402, Taiwan.
Chieh
Jen-Jie
JJ
Yang
Shieh-Yueh
SY
Yang
Hong-Chang
HC
Horng
Herng-Er
HE
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007368:Interferometry / Q000295:instrumentation*; D008280:Magnetics; D008567:Membranes, Artificial; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012212:Rheology / Q000295:instrumentation*; D012680:Sensitivity and Specificity
D008567:Membranes, Artificial