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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 13 — Jun. 30, 2014
  • pp: 15484–15501

Nonlinear optical point light sources through field enhancement at metallic nanocones

Philipp Reichenbach, Anke Horneber, Dominik A. Gollmer, Andreas Hille, Josip Mihaljevic, Christian Schäfer, Dieter P. Kern, Alfred J. Meixner, Dai Zhang, Monika Fleischer, and Lukas M. Eng  »View Author Affiliations

Optics Express, Vol. 22, Issue 13, pp. 15484-15501 (2014)

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A stable nonlinear optical point light source is investigated, based on field enhancement at individual, pointed gold nanocones with sub-wavelength dimensions. Exciting these cones with near-infrared, focused radially polarized femtosecond beams allows for tip-emission at the second harmonic wavelength (second harmonic generation, SHG) in the visible range. In fact, gold nanocones with ultra-sharp tips possess interesting nonlinear optical (NLO) properties for SHG and two-photon photoluminescence (TPPL) emission, due to the enhanced electric field confinement at the tip apex combined with centrosymmetry breaking. Using two complementary optical setups for bottom or top illumination a sharp tip SHG emission is discriminated from the broad TPPL background continuum. Moreover, comparing the experiments with theoretical calculations manifests that these NLO signatures originate either from the tip apex or the base edge of the nanocones, clearly depending on the cone size, the surrounding medium, and illumination conditions. Finally, it is demonstrated that the tip-emitted signal vanishes when switching from radial to azimuthal polarization.

© 2014 Optical Society of America

OCIS Codes
(190.3970) Nonlinear optics : Microparticle nonlinear optics
(190.4400) Nonlinear optics : Nonlinear optics, materials
(160.4236) Materials : Nanomaterials
(180.4315) Microscopy : Nonlinear microscopy

ToC Category:
Nonlinear Optics

Original Manuscript: February 25, 2014
Revised Manuscript: April 25, 2014
Manuscript Accepted: April 27, 2014
Published: June 18, 2014

Virtual Issues
Vol. 9, Iss. 8 Virtual Journal for Biomedical Optics

Philipp Reichenbach, Anke Horneber, Dominik A. Gollmer, Andreas Hille, Josip Mihaljevic, Christian Schäfer, Dieter P. Kern, Alfred J. Meixner, Dai Zhang, Monika Fleischer, and Lukas M. Eng, "Nonlinear optical point light sources through field enhancement at metallic nanocones," Opt. Express 22, 15484-15501 (2014)

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