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http://hdl.handle.net/2289/4173
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 |
URI: | http://hdl.handle.net/2289/4173 |
ISSN: | 0957-4484 1361-6528 (online) |
Alternative Location: | http://dx.doi.org/10.1088/0957-4484/22/37/375702 |
Copyright: | 2011 IOP Publishing Ltd. |
Appears in Collections: | Research Papers (LAMP) |
Files in This Item:
File | Description | Size | Format | |
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2011_NanoTech,Vol.22_p1.pdf | Open access | 899.5 kB | Adobe PDF | View/Open |
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