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

Chin Yih Hong, Jen Jie Chieh, Shieh Yueh Yang, Hong Chang Yang, Herng Er Horng

Research output: Contribution to journalArticle

6 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)5604-5611
Number of pages8
JournalApplied Optics
Issue number29
Publication statusPublished - 2009 Oct 10


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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