Nanoscale probing of image-dipole interactions in a metallic nanostructure

Chad Ropp, Zachary Cummins, Sanghee Nah, John T. Fourkas, Benjamin Shapiro and Edo Waks ()
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Chad Ropp: University of Maryland
Zachary Cummins: University of Maryland
Sanghee Nah: University of Maryland
John T. Fourkas: University of Maryland
Benjamin Shapiro: University of Maryland
Edo Waks: University of Maryland

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms7558

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