Magneto-controlled illumination with opto-fluidics

Imaging of micro- and nanofluidics is a challenge since the size of the channels is so small that the installment of additional optical and mechanical switches is very difficult. The size of the device and associated increase in viscous dissipation constitute another constraint. In response to these...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2010-07, Vol.322 (14), p.1894-1897
Main Authors: Malynych, Serhiy Z., Tokarev, Alexander, Hudson, Stephen, Chumanov, George, Ballato, John, Kornev, Konstantin G.
Format: Article
Language:English
Subjects:
Beams (radiation)
Channels
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Devices
Exact sciences and technology
Ferrofluid
Iron oxide nanoparticle
Lenses
Light scattering
Magnetic fields
Magnetooptical effects
Nanostructure
Optical fibers
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of bulk materials and thin films
Optofluidic
Physics
Ribbons
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Summary:Imaging of micro- and nanofluidics is a challenge since the size of the channels is so small that the installment of additional optical and mechanical switches is very difficult. The size of the device and associated increase in viscous dissipation constitute another constraint. In response to these limitations, this work proposes and demonstrates the manipulation of light by adding a functional lens to control the light on demand. In the present work, this lens is realized by filling a hollow fiber with a colloid of superparamagnetic Fe 3O 4 nanoparticles. When the propagation of light is perpendicular to the magnetic field, this lens stretches the circular beam into a ribbon yielding a larger visible area. Potentially, one can apply a rotating magnetic field thus illuminating a larger spot size or creating other beam geometries. Such composite fibers might also be of value for Faraday isolation and other magneto-optic effects in optical fibers.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2010.01.003