Adiabatic nanofocusing scattering-type optical nanoscopy of individual gold nanoparticles

Diyar Sadiq, Javid Shirdel, Jae Sung Lee, Elena Selishcheva, Namkyoo Park, Christoph Lienau

Research output: Contribution to journalArticle

75 Scopus citations

Abstract

We explore imaging of local electromagnetic fields in the vicinity of metallic nanoparticles using a grating-coupled scattering-type near-field scanning optical microscope. In this microscope, propagating surface plasmon polariton wavepackets are launched onto smooth gold tapers where they are adiabatically focused toward the nanometer-sized taper apex. We report two-dimensional raster-scanned optical images showing pronounced near-field contrast and demonstrating sub-30 nm resolution imaging of localized surface plasmon polariton fields of spherical and elliptical nanoparticles. By comparison to three-dimensional finite-difference time domain simulations, we conclude that virtually background-free near-field imaging is achieved. The microscope combines deep subwavelength resolution, high local field intensities and a straightforward imaging contrast, making it interesting for a variety of applications in linear and nonlinear nanospectroscopy.

Original languageEnglish
Pages (from-to)1609-1613
Number of pages5
JournalNano Letters
Volume11
Issue number4
DOIs
StatePublished - 13 Apr 2011

Keywords

  • FDTD simulation
  • Surface plasmon polaritons
  • adiabatic nanofocusing
  • metallic nanoparticles
  • scattering-type near-field scanning optical microscopy

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