Abstract
The optical force acting on the magnetic nanoparticles (MNPs) is investigated with the magnetic-fluid-filled fiber-optic Fabry-Perot interferometer. The shift of interference spectra is related with the local refractive index variation in the light path, which is assigned to the optical-force-induced outward movement of MNPs. The influence of magnetic fluid’s viscosity, ambient temperature, strength and orientation of the externally applied magnetic field on the optical-force-induced MNPs’ movement is studied in details. The results of this work provide a further understanding of interaction between light and MNPs and clarify the dynamic micro-processes of MNPs within magnetic fluid under external stimuli. It may have the potentials in the fields of light-controllable magnetic-fluid-based devices and vector magnetic field detection.
Highlights
In 1970, Ashkin first observed that the transparent dielectric particles can be trapped within the beam center, which is assigned to the optical forces[1]
It has been well studied that the refractive index (RI) of Magnetic fluid (MF) depends on the externally applied magnetic field and ambient temperature, which is attributed to the microstructural formation of magnetic nanoparticles (MNPs) within the MF23,26
For optical applications based on MF, the optical forces may “parasitically” occur and influence the movement of MNPs, which will lead to the RI change and affect the device performance
Summary
In 1970, Ashkin first observed that the transparent dielectric particles can be trapped within the beam center, which is assigned to the optical forces[1]. For optical applications based on MF, the optical forces may “parasitically” occur and influence the movement of MNPs, which will lead to the RI change and affect the device performance. This has not been revealed in the past studies. Two kinds of MF-filled fiber-optic Fabry-Perot interferometer (MF-FPI) are fabricated Their optical response to incident light is investigated. Through monitoring the interference spectral shift of the MF-FPI, the optical-force-induced local concentration variation of MNPs and the effect of optical force acting on the MNPs can be investigated
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