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Nanoscopy through a plasmonic nanolens.

Matthew J Horton1, Oluwafemi S Ojambati1, Rohit Chikkaraddy1

  • 1NanoPhotonics Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, CB3 0HE Cambridge, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|January 17, 2020
PubMed
Summary
This summary is machine-generated.

Plasmonic nanogaps enable precise, 1-nm localization of single molecules by analyzing light emission patterns. This breakthrough allows real-time tracking and imaging of molecular positions within plasmonic "crystal balls."

Keywords:
nanogapnanoscopyplasmonicssingle moleculesuper-resolution

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Spectroscopy

Background:

  • Plasmonic nanostructures enhance spectroscopic sensitivity for single-molecule detection and real-time tracking.
  • Current plasmonic sensors often lose spatial information of molecules within hot spots.

Purpose of the Study:

  • To demonstrate that ultrathin plasmonic nanogaps can precisely reconstruct the spatial positions of embedded emitters.
  • To explore the imaging potential of plasmonic nanogaps for nanoscale localization.

Main Methods:

  • Utilizing ultrathin plasmonic nanogaps to support complete mode sets.
  • Analyzing the influence of these modes on far-field emission patterns of embedded emitters.
  • Reconstructing dipole positions with 1-nm precision based on observed emission patterns.

Main Results:

  • Complete mode sets in nanogaps strongly influence far-field emission patterns.
  • Distinct emission patterns (spots, rings, halos) reveal emitter locations.
  • Demonstrated reconstruction of dipole positions with 1-nm precision.
  • Emitters at the nanogap center exhibit extremely rapid radiation.

Conclusions:

  • Ultrathin plasmonic nanogaps enable high-precision spatial localization of single molecules.
  • The observed emission patterns act as unique fingerprints for emitter positioning.
  • Plasmonic nanogaps offer significant potential for advanced nanoscale imaging and sensing applications.