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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 2, Iss. 12 — Dec. 1, 2012
  • pp: 1760–1767

The increase of the light transparency induced by a magnetic field for the colloid film based on α–FeOOH nanoparticles

Jian Li, Anrong Wang, Yueqiang Lin, Xiaodong Liu, Jun Fu, Lihua Lin, and Longlong Chen  »View Author Affiliations


Optical Materials Express, Vol. 2, Issue 12, pp. 1760-1767 (2012)
http://dx.doi.org/10.1364/OME.2.001760


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Abstract

α–FeOOH nanoparticles are spherical and weakly magnetic. The size of the particles is about 8 nm, so they are regarded as Rayleigh scatterers. Aqueous colloids based on these particles exhibit magnetically enhanced transmission of light; the relative transmission coefficient reaches almost 1.3 when H = 500 Oe. Since the magnetic interaction between the particles is too weak to form chain-like aggregates, the enhancing effect is mainly attributed to the variation of the absorption cross-sections of the colloidal system in relation to the coupling of magnetic and dielectric properties of the particles. Along the direction of the external magnetic field, the absorption cross-section of the colloid decreases so that the transmitted light parallel to the field direction is enhanced and increases with the field. The results of this investigation indicate that there could be potential applications for weakly magnetic colloids based on non-cubical nanocrystals.

© 2012 OSA

OCIS Codes
(160.3820) Materials : Magneto-optical materials
(350.4990) Other areas of optics : Particles

ToC Category:
Magneto-optic Materials

History
Original Manuscript: August 30, 2012
Revised Manuscript: October 17, 2012
Manuscript Accepted: November 5, 2012
Published: November 8, 2012

Citation
Jian Li, Anrong Wang, Yueqiang Lin, Xiaodong Liu, Jun Fu, Lihua Lin, and Longlong Chen, "The increase of the light transparency induced by a magnetic field for the colloid film based on α–FeOOH nanoparticles," Opt. Mater. Express 2, 1760-1767 (2012)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-2-12-1760


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