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Proceedings Paper

Mapping local field distribution at metal nanostructures by near-field second-harmonic generation
Author(s): Michele Celebrano; Margherita Zavelani-Rossi; Paolo Biagioni; Dario Polli; Marco Finazzi; Lamberto Duò; Giulio Cerullo; Massimiliano Labardi; Maria Allegrini; Johan Grand; Pascal Royer; Pierre-Michel Adam
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Paper Abstract

We study nonlinear optical response of nanofabricated gold particles with sub-100-nm spatial resolution by means of non-linear near-field scanning optical microscopy (NSOM). In our instrument, femtosecond pulses at 800 nm wavelength are coupled to hollow-pyramid aperture sensors. Such probes show high throughput and preserve pulse duration and polarization, enabling the achievement of sufficiently high peak power in the near field to perform nonlinear optics on the nanoscale. We study second-harmonic generation (SHG) from gold nanoparticles of two different kinds, namely, closely-packed gold triangles and nanoellipsoids. We find a strong dependence of SHG efficiency on the shape and the fine structure of the nanoparticles. Near-field SHG is therefore a subwavelength resolution probe of local field enhancements occurring at specific sites of the particles. This work is focused on the dependence of NSOM linear and nonlinear images on the aperture size and linear polarization direction of light. Our measurements give strong evidence that SHG is mainly excited by a high field concentration at the rims of the metal NSOM aperture. This conclusion is supported by the high spatial resolution obtained for SHG even with apertures so large that FW imaging shows much poorer resolution.

Paper Details

Date Published: 28 September 2007
PDF: 8 pages
Proc. SPIE 6641, Plasmonics: Metallic Nanostructures and Their Optical Properties V, 66411E (28 September 2007); doi: 10.1117/12.733838
Show Author Affiliations
Michele Celebrano, Istituto di Fotonica e Nanotecnologie, CNR, Politecnico di Milano (Italy)
Margherita Zavelani-Rossi, Istituto di Fotonica e Nanotecnologie, CNR, Politecnico di Milano (Italy)
Paolo Biagioni, Politecnico di Milano (Italy)
Dario Polli, Istituto di Fotonica e Nanotecnologie, CNR, Politecnico di Milano (Italy)
Marco Finazzi, Politecnico di Milano (Italy)
Lamberto Duò, Politecnico di Milano (Italy)
Giulio Cerullo, Istituto di Fotonica e Nanotecnologie, CNR, Politecnico di Milano (Italy)
Massimiliano Labardi, CNR-INFM, Univ. di Pisa (Italy)
Maria Allegrini, CNR-INFM, Univ. di Pisa (Italy)
Johan Grand, Institut Charles Delaunay, CNRS, LNIO, Univ. de Technologie de Troyes (France)
Pascal Royer, Institut Charles Delaunay, CNRS, LNIO, Univ. de Technologie de Troyes (France)
Pierre-Michel Adam, Institut Charles Delaunay, CNRS, LNIO, Univ. de Technologie de Troyes (France)


Published in SPIE Proceedings Vol. 6641:
Plasmonics: Metallic Nanostructures and Their Optical Properties V
Mark I. Stockman, Editor(s)

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