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

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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 similar to 10(6) cm(3)/GW(2)) and large two-photon absorption (2PA coefficient similar to 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. (C) 2008 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2008-07
Language
English
Article Type
Article
Keywords

OPTICAL NONLINEARITIES; NANOPARTICLES; DYES

Citation

OPTICS EXPRESS, v.16, no.15, pp.11193 - 11202

ISSN
1094-4087
DOI
10.1364/OE.16.011193
URI
http://hdl.handle.net/10203/212756
Appears in Collection
PH-Journal Papers(저널논문)
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