Phase-sensitive spectroscopy of surface plasmons in individual metal nanostructures

A. A. Mikhailovsky, M. A. Petruska, Kuiru Li, M. I. Stockman, V. I. Klimov

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Abstract

We analyze both theoretically and experimentally the response of individual gold nanoparticles and nanoparticle dimers to a near-field excitation with broad-band radiation (a femtosecond white-light continuum) delivered through a subwavelength aperture. Because of the coherent superposition of the field emitted by the aperture and the secondary field reemitted by the nanostructure, the signals detected in the far zone exhibit a pronounced dependence on the phase of plasmon oscillations excited in the nanostructure. This phase sensitivity allows us to accurately determine positions of plasmon resonances not distorted by dielectric losses in a metal. In the near-field extinction spectra of individual nanoparticles, the plasmon resonance is observed as the “zero-extinction” point in which the transition from constructive (lower spectral energies) to destructive (higher spectral energies) interference occurs. By using spatially selective near-field excitation with a femtosecond white-light continuum, we are able to detect slight asymmetries in dimers composed of nominally identical nanoparticles.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number8
DOIs
Publication statusPublished - Jan 1 2004

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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