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Digital plasmonic holography.

Joseph W Nelson1, Greta R Knefelkamp1, Alexandre G Brolo2,3

  • 1Department of Physics and Engineering, Bethel University, 3900 Bethel Drive, St Paul, MN 55112 USA.

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Summary
This summary is machine-generated.

We developed digital plasmonic holography for high-resolution in-plane imaging using surface plasmons. This lens-less technique captures the full complex wave of propagating plasmons without needing mirrors or lenses.

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Area of Science:

  • Plasmonics
  • Holography
  • Nanophotonics

Background:

  • Surface plasmon polaritons enable sub-wavelength imaging but lack in-plane optical components like lenses and mirrors.
  • Conventional digital holography records amplitude and phase for 3D information, but plasmonic imaging requires specialized techniques for in-plane analysis.

Purpose of the Study:

  • To demonstrate a lens-less digital plasmonic holography method for direct in-plane imaging of propagating surface plasmons.
  • To overcome limitations in current surface plasmon imaging by extracting both amplitude and phase information.

Main Methods:

  • Utilized lens-less, point-source digital plasmonic holography.
  • Recorded plasmonic holograms using a dual-probe near-field scanning optical microscope and fluorescent screens.
  • Employed digital decoding of interference patterns to reconstruct the plasmon wave's amplitude and phase.

Main Results:

  • Achieved high-resolution, direct in-plane imaging of propagating surface plasmons.
  • Demonstrated that point-source geometry provides in-plane magnification for enhanced resolution.
  • Successfully extracted both phase and amplitude of the plasmon wave from a 1D recording.

Conclusions:

  • Digital plasmonic holography offers a novel approach for high-resolution in-plane imaging without plasmonic lenses or mirrors.
  • This technique enables the capture of the complete complex wave information of surface plasmons.
  • Opens new avenues for advanced nanoscale imaging and characterization in plasmonics.