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Nanoscale probing of image-dipole interactions in a metallic nanostructure

Author

Listed:
  • Chad Ropp

    (University of Maryland)

  • Zachary Cummins

    (University of Maryland)

  • Sanghee Nah

    (University of Maryland)

  • John T. Fourkas

    (University of Maryland
    Institute for Physical Science and Technology, University of Maryland)

  • Benjamin Shapiro

    (University of Maryland)

  • Edo Waks

    (University of Maryland
    Joint Quantum Institute, National Institute of Standards and Technology, University of Maryland)

Abstract

An emitter near a surface induces an image dipole that can modify the observed emission intensity and radiation pattern. These image-dipole effects are generally not taken into account in single-emitter tracking and super-resolved imaging applications. Here we show that the interference between an emitter and its image dipole induces a strong polarization anisotropy and a large spatial displacement of the observed emission pattern. We demonstrate these effects by tracking the emission of a single quantum dot along two orthogonal polarizations as it is deterministically positioned near a silver nanowire. The two orthogonally polarized diffraction spots can be displaced by up to 50 nm, which arises from a Young’s interference effect between the quantum dot and its induced image dipole. We show that the observed spatially varying interference fringe provides a useful measure for correcting image-dipole-induced distortions. These results provide a pathway towards probing and correcting image-dipole effects in near-field imaging applications.

Suggested Citation

  • Chad Ropp & Zachary Cummins & Sanghee Nah & John T. Fourkas & Benjamin Shapiro & Edo Waks, 2015. "Nanoscale probing of image-dipole interactions in a metallic nanostructure," Nature Communications, Nature, vol. 6(1), pages 1-8, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7558
    DOI: 10.1038/ncomms7558
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