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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 10 — May. 15, 2010
  • pp: 1560–1562

Intensity-dependent reversal of nonlinearity sign in a gold nanoparticle array

Kai Wang, Hua Long, Ming Fu, Guang Yang, and Peixiang Lu  »View Author Affiliations

Optics Letters, Vol. 35, Issue 10, pp. 1560-1562 (2010)

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The optical nonlinearities of a Au nanoparticle array were determined by performing Z-scan measurements with a femtosecond laser ( 800 nm , 50 fs ). As the exciting energy increased, the nonlinear absorption of the Au nanoparticle array changed from reverse-saturable absorption to saturable absorption, while the nonlinear refraction changed from self-defocusing to self-focusing, which implies competition between ground-state bleaching and two-photon absorption. One- and two-photon figures of merit of W = 5.1 and T = 0.11 , respectively, were obtained that satisfy the demand, W > 1 and T < 1 , for all-optical switching.

© 2010 Optical Society of America

OCIS Codes
(190.3970) Nonlinear optics : Microparticle nonlinear optics
(110.4235) Imaging systems : Nanolithography
(160.4236) Materials : Nanomaterials

ToC Category:
Imaging Systems

Original Manuscript: January 4, 2010
Revised Manuscript: March 12, 2010
Manuscript Accepted: March 21, 2010
Published: May 5, 2010

Kai Wang, Hua Long, Ming Fu, Guang Yang, and Peixiang Lu, "Intensity-dependent reversal of nonlinearity sign in a gold nanoparticle array," Opt. Lett. 35, 1560-1562 (2010)

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