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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 13 — Jun. 21, 2010
  • pp: 13874–13879

Size-related third-order optical nonlinearities of Au nanoparticle arrays

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

Optics Express, Vol. 18, Issue 13, pp. 13874-13879 (2010)

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We report a systematic study of the size-related nonlinear optical properties of triangular Au particles. The triangular Au nanoparticle arrays of four sizes (37 nm, 70 nm, 140 nm and 190 nm) were fabricated on quartz substrates using nanosphere lithography. By performing the Z-scan method with femtosecond laser (800 nm, 50 fs), the optical nonlinearities of Au nanoparticle arrays were determined. The results showed a size-related competition between two mechanisms of ground-state bleaching and two-photon absorption. As the size increased, the nonlinear absorption changed from two-photon absorption to saturated absorption, while the nonlinear refraction changed from self-defocusing to self-focusing. These size-tunable nonlinearities make it possible to optimize the one- and two-photon figures of merit, W and T, 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:
Nonlinear Optics

Original Manuscript: May 13, 2010
Revised Manuscript: June 9, 2010
Manuscript Accepted: June 10, 2010
Published: June 14, 2010

Peixiang Lu, Kai Wang, Hua Long, Ming Fu, and Guang Yang, "Size-related third-order optical nonlinearities of Au nanoparticle arrays," Opt. Express 18, 13874-13879 (2010)

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