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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 6 — Mar. 16, 2009
  • pp: 4652–4658

Coherent nonlinear emission from a single KTP nanoparticle with broadband femtosecond pulses

Paweł Wnuk, Loc Le Xuan, Abdallah Slablab, Cédric Tard, Sandrine Perruchas, Thierry Gacoin, Jean-François Roch, Dominique Chauvat, and Czesław Radzewicz  »View Author Affiliations

Optics Express, Vol. 17, Issue 6, pp. 4652-4658 (2009)

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We demonstrate that the intensity of the second harmonic (SH) generated in KTiOPO4 nanoparticles excited with femtosecond laser pulses increases with decreasing duration of the infrared pump pulses. The SH intensity scales, approximately, as the inverse of the laser pulse duration ranging between 13 fs and 200 fs. The SH intensity enhancement requires careful compensation of the high-order spectral phase, being achieved with a genetic algorithm. Using ultrashort laser pulses improves the signal-to-noise ratio and will allow the detection of 10-nm size particles. Finally, we demonstrate that the spectrum of broadband (100 nm) pulses can be shaped to generate non-degenerate sum-frequency mixing. This opens up access to the polarization degrees of freedom of this second-order nonlinear process at the nanoscale.

© 2009 Optical Society of America

OCIS Codes
(170.0180) Medical optics and biotechnology : Microscopy
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.3970) Nonlinear optics : Microparticle nonlinear optics
(190.4180) Nonlinear optics : Multiphoton processes
(320.5540) Ultrafast optics : Pulse shaping
(180.4315) Microscopy : Nonlinear microscopy

ToC Category:
Nonlinear Optics

Original Manuscript: January 23, 2009
Revised Manuscript: February 16, 2009
Manuscript Accepted: February 16, 2009
Published: March 9, 2009

Virtual Issues
Vol. 4, Iss. 5 Virtual Journal for Biomedical Optics

Pawel Wnuk, Loc L. Xuan, Abdallah Slablab, Cédric Tard, Sandrine Perruchas, Thierry Gacoin, Jean-François Roch, Dominique Chauvat, and Czeslaw Radzewicz, "Coherent nonlinear emission from a single KTP nanoparticle with broadband femtosecond pulses," Opt. Express 17, 4652-4658 (2009)

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