Control parameters for the tunable refractive index of magnetic fluid films

Author:

Hong Chin-Yih1,Yang S. Y.2,Horng H. E.32,Yang H. C.4

Affiliation:

1. Department of Mechanical And Automation Engineering, Da-Yeh University, Chang-Hwa 515, Taiwan

2. Institute of Electro-optical Science And Technology, National Taiwan Normal University, Taipei 116, Taiwan

3. Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan

4. Department of Physics, National Taiwan University, Taipei 106, Taiwan

Abstract

In this work, we systematically investigate the influence of control parameters, including the concentration of magnetic particles, film thickness, external field direction, and field sweep rate, on the magnetically tunable refractive index of magnetic fluid films. We find that the variation in the refractive index of the magnetic fluid film with rising field strength is enhanced by increasing either the concentration or the film thickness, or by applying the field along the film surface, whereas it is independent of the sweep rate of the field. The results clearly reveal how to control the tunable refractive index of magnetic fluid films. Furthermore, they provide valuable information that may assist in the development of magnetic-fluid-based index-tunable devices.

Publisher

AIP Publishing

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