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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 15 — Jul. 21, 2008
  • pp: 11193–11202

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

John Kiran Anthony, Hee Cheoul Kim, Hwang Woon Lee, S. Kumar Mahapatra, Hae Min Lee, Chang Koo Kim, Kihong Kim, Hanjo Lim, and Fabian Rotermu  »View Author Affiliations

Optics Express, Vol. 16, Issue 15, pp. 11193-11202 (2008)

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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 ~ 106 cm3/GW2) and large two-photon absorption (2PA coefficient ~ 105 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.

© 2008 Optical Society of America

OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(190.4180) Nonlinear optics : Multiphoton processes
(190.4720) Nonlinear optics : Optical nonlinearities of condensed matter
(160.4236) Materials : Nanomaterials

ToC Category:
Nonlinear Optics

Original Manuscript: June 5, 2008
Revised Manuscript: July 7, 2008
Manuscript Accepted: July 8, 2008
Published: July 10, 2008

John Kiran Anthony, Hee Cheoul Kim, Hwang Woon Lee, S. Kumar Mahapatra, Hae Min Lee, Chang Koo Kim, Kihong Kim, Hanjo Lim, and Fabian Rotermund, "Particle size-dependent giant nonlinear absorption in nanostructured Ni-Ti alloys," Opt. Express 16, 11193-11202 (2008)

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