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Plasmonic band structure controls single-molecule fluorescence.

Lutz Langguth1, Deep Punj, Jérôme Wenger

  • 1Center for Nanophotonics, FOM Institute for Atomic and Molecular Physics (AMOLF) , Science Park 104, 1098 XG Amsterdam, The Netherlands.

ACS Nano
|September 12, 2013
PubMed
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Researchers explored controlling single-emitter fluorescence using hexagonal nanoaperture arrays. Small plasmonic crystal lattices directed and enhanced emission from single molecules, demonstrating a new method for fluorescence engineering.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Quantum Emitters

Background:

  • Plasmonics and photonic crystals offer methods to control light-matter interactions.
  • Tailoring single-emitter fluorescence is crucial for quantum technologies and sensing.
  • Existing methods often rely on bulk materials or large structures.

Purpose of the Study:

  • To investigate spontaneous emission control using finite-sized hexagonal arrays of nanoapertures in gold films.
  • To demonstrate enhanced and directional fluorescence from single emitters coupled to plasmonic crystals.
  • To explore the role of plasmonic crystal band structure in emission directionality.

Main Methods:

  • Fabrication of hexagonal arrays of nanoapertures in gold film.
  • Coupling single fluorescent molecules to the central aperture of the arrays.

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  • Characterization of fluorescence emission directionality and enhancement.
  • Full-wave numerical simulations to confirm plasmonic band structure effects.

    • Main Results:

    • Finite-sized hexagonal nanoaperture arrays enable highly directional and enhanced single-emitter fluorescence.
    • Even small lattices (four unit cells) effectively set emission directionality.
    • The plasmonic crystal band structure dictates the observed directionality.
    • Demonstrated plasmonic phase array antenna behavior driven by quantum emitters.

    Conclusions:

    • Finite plasmonic crystals provide a flexible platform for controlling spontaneous emission.
    • This approach offers a novel toolbox for engineering fluorescence and its detection.
    • The findings bridge plasmonics and photonic crystals for advanced light manipulation.