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
Resource
Applied Optics, 48(29), 5604-5611
Journal
Applied Optics
Pages
5604
Date Issued
2009
Date
2009
Author(s)
Hong, Chin-Yih
Chieh, Jen-Jie
Yang, Shieh-Yueh
Yang, Hong-Chang
Horng, Herng-Er
Abstract
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.
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