Quantitative imaging of the optical near field

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2012
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García de Abajo, F. Javier
Solis, Javier
Siegel, Jan
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Optics Express. 2012, 20(20), pp. 22063-22078. eISSN 1094-4087. Available under: doi: 10.1364/OE.20.022063
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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.

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ISO 690KÜHLER, Paul, F. Javier GARCÍA DE ABAJO, Philipp LEIPRECHT, Andreas KOLLOCH, Javier SOLIS, Paul LEIDERER, Jan SIEGEL, 2012. Quantitative imaging of the optical near field. In: Optics Express. 2012, 20(20), pp. 22063-22078. eISSN 1094-4087. Available under: doi: 10.1364/OE.20.022063
BibTex
@article{Kuhler2012-09-24Quant-20742,
  year={2012},
  doi={10.1364/OE.20.022063},
  title={Quantitative imaging of the optical near field},
  number={20},
  volume={20},
  journal={Optics Express},
  pages={22063--22078},
  author={Kühler, Paul and García de Abajo, F. Javier and Leiprecht, Philipp and Kolloch, Andreas and Solis, Javier and Leiderer, Paul and Siegel, Jan}
}
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