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Nanostructure-Induced Distortion in Single-Emitter Microscopy.

Kangmook Lim1, Chad Ropp, Sabyasachi Barik1

  • 1Joint Quantum Institute, University of Maryland and the National Institute of Standards and Technology , College Park, Maryland 20742, United States.

Nano Letters
|August 24, 2016
PubMed
Summary
This summary is machine-generated.

Metallic nanoparticles distort single-emitter microscopy imaging accuracy, shifting quantum dot diffraction spots over 35 nm. This dielectric distortion, not scattering, offers new sub-diffraction imaging methods for nanostructures.

Keywords:
Super-resolution microscopydisplacementdistortionimagingnear-field couplingprobing

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Area of Science:

  • Nanophotonics
  • Super-resolution microscopy
  • Quantum optics

Background:

  • Single-emitter microscopy achieves nanoscale resolution by locating emitter centroids below the diffraction limit.
  • High-dielectric nanostructures like noble metals distort emitter radiation patterns, degrading imaging accuracy.
  • Polarization-resolved imaging is challenging for nanoparticles due to their lack of symmetry and complex scattering effects.

Purpose of the Study:

  • To investigate and quantify the distortion effects of metallic nanoparticles on single-emitter microscopy.
  • To understand the interplay between dielectric distortion and scattering in nanoparticle-emitter interactions.
  • To develop new methods for high-resolution imaging of nanostructures using these distortion effects.

Main Methods:

  • Utilizing a single quantum dot as a probe for metallic nanoparticle-induced imaging distortions.
  • Measuring the magnitude and direction of diffraction spot shifts caused by nanoparticles.
  • Analyzing the dominance of dielectric distortion over scattering effects.

Main Results:

  • Metallic nanoparticles significantly distort single-emitter imaging accuracy up to 35 nm shifts at distances over 300 nm.
  • Emitter centroid shifts are generally away from the nanoparticle, contrary to scattering-induced attraction.
  • Dielectric distortion of the emission pattern was found to dominate over scattering effects.

Conclusions:

  • Metallic nanoparticles introduce significant, previously underestimated distortions in single-emitter microscopy.
  • The observed distortions, driven by dielectric effects, can be leveraged for novel sub-diffraction spatial imaging of nanoparticles.
  • This work enhances understanding of emitter-nanostructure near-field coupling for improved super-resolution microscopy accuracy.