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Nonlinear plasmon-photon interaction resolved by k-space spectroscopy.

Nicolai B Grosse1, Jan Heckmann, Ulrike Woggon

  • 1Institut für Optik und Atomare Physik, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany.

Physical Review Letters
|May 1, 2012
PubMed
Summary
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Researchers used k-space spectroscopy to observe surface plasmons (SPs) in metal nanostructures. They found that two SPs can combine to create a second-harmonic photon, enabling new light-based technologies.

Area of Science:

  • Plasmonics
  • Nonlinear Optics
  • Nanophotonics

Background:

  • Metallic nanostructures exhibit surface-plasmon (SP) resonances, leading to significant optical field enhancement.
  • Surface plasmons are linked to enhanced nonlinear optical phenomena like second-harmonic generation (SHG), but their precise role remains unclear.

Purpose of the Study:

  • To experimentally distinguish between plasmonic and photonic contributions to SHG in metal nanofilms.
  • To elucidate the fundamental interaction mechanism of surface plasmons in nonlinear optical processes.

Main Methods:

  • Utilized k-space spectroscopy to analyze optical phenomena in metal nanofilms.
  • Employed the Kretschmann geometry for optical excitation of surface plasmons.

Main Results:

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  • Demonstrated the ability to differentiate plasmonic SHG from photonic SHG.
  • Observed a novel nonlinear process where two surface plasmons annihilate to generate a second-harmonic photon.

Conclusions:

  • The study clarifies the role of surface plasmons as quasiparticles in nonlinear optical interactions.
  • Findings pave the way for plasmonic parametric down-conversion, potentially creating entangled SP pairs for quantum applications.