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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 20 — Sep. 24, 2012
  • pp: 22063–22078

Quantitative imaging of the optical near field

Paul Kühler, F. Javier García de Abajo, Philipp Leiprecht, Andreas Kolloch, Javier Solis, Paul Leiderer, and Jan Siegel  »View Author Affiliations

Optics Express, Vol. 20, Issue 20, pp. 22063-22078 (2012)

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When exposing small particles on a substrate to a light plane wave, the scattered optical near field is spatially modulated and highly complex. We show, for the particular case of dielectric microspheres, that it is possible to image these optical near-field distributions in a quantitative way. By placing a single microsphere on a thin film of the photosensitive phase change material Ge2Sb5Te5 and exposing it to a single short laser pulse, the spatial intensity modulation of the near field is imprinted into the film as a pattern of different material phases. The resulting patterns are investigated by using optical as well as high-resolution scanning electron microscopy. Quantitative information on the local optical near field at each location is obtained by calibrating the material response to pulsed laser irradiation. We discuss the influence of polarization and angle of incidence of the laser beam as well as particle size on the field distribution. The experimental results are in good quantitative agreement with a model based on a rigorous solution of Maxwell’s equations. Our results have potential application to near-field optical lithography and experimental determination of near fields in complex nanostructures.

© 2012 OSA

OCIS Codes
(240.0240) Optics at surfaces : Optics at surfaces
(290.0290) Scattering : Scattering
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Optics at Surfaces

Original Manuscript: May 7, 2012
Revised Manuscript: June 22, 2012
Manuscript Accepted: June 26, 2012
Published: September 12, 2012

Paul Kühler, F. Javier García de Abajo, Philipp Leiprecht, Andreas Kolloch, Javier Solis, Paul Leiderer, and Jan Siegel, "Quantitative imaging of the optical near field," Opt. Express 20, 22063-22078 (2012)

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