Particle size-dependent giant nonlinear absorption in nanostructured Ni-Ti alloys

The nonlinear absorption in nanostructured Ni-Ti alloys, fabricated by electrochemical deposition, was investigated at 532 and 1064 nm. The type of nonlinear absorption (saturable or reverse saturable absorption) was observed to depend on the laser intensity as well as on the nanoparticle size. The...

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Bibliographic Details
Published in:Optics express 2008-07, Vol.16 (15), p.11193-11202
Main Authors: Anthony, John Kiran, Kim, Hee Cheoul, Lee, Hwang Woon, Mahapatra, S Kumar, Lee, Hae Min, Kim, Chang Koo, Kim, Kihong, Lim, Hanjo, Rotermund, Fabian
Format: Article
Language:English
Subjects:
Absorption
Alloys
Computer Simulation
Energy Transfer
Light
Models, Chemical
Nanostructures - chemistry
Nanostructures - ultrastructure
Nickel - chemistry
Nonlinear Dynamics
Particle Size
Scattering, Radiation
Titanium - chemistry
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Summary:The nonlinear absorption in nanostructured Ni-Ti alloys, fabricated by electrochemical deposition, was investigated at 532 and 1064 nm. The type of nonlinear absorption (saturable or reverse saturable absorption) was observed to depend on the laser intensity as well as on the nanoparticle size. The nanostructured Ni-Ti alloys comprising particle mean diameters of 20 and 30 nm exhibited large three-photon absorption (3PA coefficient approximately 10(6) cm(3)/GW(2)) and large two-photon absorption (2PA coefficient approximately 10(5) cm/GW) at 532 nm, respectively. The observed change over from reverse saturable absorption to saturable absorption at high peak intensities has qualitatively been analyzed by the excited-state theory of conduction electrons.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.16.011193