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Title: Nonlinear and magneto-optical transmission studies on magnetic nanofluids of non-interacting metallic nickel nanoparticles
Authors: Mary, A.P.R.
Sandeep, Suchand C.S.
Narayanan, T.N.
Philip, Reji
Moloney, Padraig
Ajayan, P.M.
Anantharaman, M.R.
Issue Date: 16-Sep-2011
Publisher: IOP Publishing Ltd.
Citation: Nanotechnology, 2011, Vol.22, 375702
Abstract: Oxide free stable metallic nanofluids have the potential for various applications such as in thermal management and inkjet printing apart from being a candidate system for fundamental studies. A stable suspension of nickel nanoparticles of ∼5 nm size has been realized by a modified two-step synthesis route. Structural characterization by x-ray diffraction and transmission electron microscopy shows that the nanoparticles are metallic and are phase pure. The nanoparticles exhibited superparamagnetic properties. The magneto-optical transmission properties of the nickel nanofluid (Ni-F) were investigated by linear optical dichroism measurements. The magnetic field dependent light transmission studies exhibited a polarization dependent optical absorption, known as optical dichroism, indicating that the nanoparticles suspended in the fluid are non-interacting and superparamagnetic in nature. The nonlinear optical limiting properties of Ni-F under high input optical fluence were then analyzed by an open aperture z-scan technique. The Ni-F exhibits a saturable absorption at moderate laser intensities while effective two-photon absorption is evident at higher intensities. The Ni-F appears to be a unique material for various optical devices such as field modulated gratings and optical switches which can be controlled by an external magnetic field.
Description: Open Access
ISSN: 0957-4484
1361-6528 (online)
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Copyright: 2011 IOP Publishing Ltd.
Appears in Collections:Research Papers (LAMP)

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