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Plasmon-Exciton Coupling Using DNA Templates.

Eva-Maria Roller1, Christos Argyropoulos2, Alexander Högele1

  • 1Faculty of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität (LMU) München , Geschwister-Scholl- Platz 1, 80539 Munich, Germany.

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Summary
This summary is machine-generated.

DNA origami enables precise control over plasmon-exciton nanostructures. This allows for strong coupling and tunable hybrid states, paving the way for room-temperature plasmonic devices.

Keywords:
DNA origamiJ-aggregatesRabi splittingexcitonsplasmonsplexcitons

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Area of Science:

  • Plasmonics and Nanophotonics
  • Biomolecular Nanotechnology
  • Quantum Optics

Background:

  • Strong coupling between plasmons and excitons leads to hybrid states with unique optical properties.
  • Controlling nanostructure geometry is crucial for tuning plasmon resonance and achieving strong coupling.
  • DNA origami offers precise spatial control for assembling nanostructures.

Purpose of the Study:

  • To engineer and investigate plasmon-exciton hybrid states using DNA origami.
  • To demonstrate tunable plasmon resonance by varying nanoparticle size.
  • To achieve strong plasmon-exciton coupling at the single-structure level.

Main Methods:

  • Utilizing DNA origami for precise self-assembly of metallic nanoparticle dimers.
  • Varying nanoparticle diameter (30-60 nm) while maintaining fixed interparticle spacing.
  • Characterizing plasmon-exciton coupling through far-field scattering measurements.

Main Results:

  • Achieved strong plasmon-exciton coupling in DNA-origami-assembled nanostructures.
  • Demonstrated tunable plasmon resonance by adjusting nanoparticle diameter to match exciton energy.
  • Observed normal mode splitting up to 170 meV in individual hybrid structures.

Conclusions:

  • DNA origami is an effective platform for bottom-up assembly of tunable plasmon-exciton systems.
  • Precise control over nanodimer geometry enables strong coupling and field confinement.
  • These findings offer a pathway for developing room-temperature plasmon-exciton devices.