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Related Experiment Videos

Enhanced nonlinear optical effects with a tapered plasmonic waveguide.

Ewold Verhagen1, Laurens Kuipers, Albert Polman

  • 1Center for Nanophotonics, FOM Institute for Atomic and Molecular Physics (AMOLF), Kruislaan 407, 1098 SJ Amsterdam, The Netherlands. verhagen@amolf.nl

Nano Letters
|February 15, 2007
PubMed
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Infrared surface plasmon polaritons (SPPs) are concentrated in a tapered silver waveguide, enhancing light-matter interactions. This concentration boosts upconversion luminescence intensity from erbium ions via multiphoton processes.

Area of Science:

  • Photonics and Plasmonics
  • Materials Science
  • Nanotechnology

Background:

  • Surface plasmon polaritons (SPPs) are electromagnetic waves coupled to the electron oscillations on a metal surface.
  • Confining SPPs is crucial for developing advanced optical devices and enhancing light-matter interactions.
  • Tapered waveguides offer a promising geometry for SPP manipulation and concentration.

Purpose of the Study:

  • To investigate the concentration of infrared surface plasmon polaritons (SPPs) in a laterally tapered planar silver waveguide.
  • To probe the near-field properties of SPPs using upconversion luminescence from erbium (Er) ions.
  • To demonstrate the enhancement of multiphoton processes due to SPP concentration.

Main Methods:

  • Excitation of SPPs at a silver-sapphire interface using 1490 nm light.

Related Experiment Videos

  • Probing the SPP near field via photoluminescence of upconverted Er ions at 550 and 660 nm.
  • Observation and analysis of SPP interference patterns to confirm concentration.

    • Main Results:

    • Clear evidence of SPP concentration toward the taper end was observed through interference patterns.
    • An enhancement in the upconversion luminescence intensity from Er energy levels was detected.
    • The results confirm that SPP concentration leads to intensified multiphoton processes.

    Conclusions:

    • Laterally tapered planar silver waveguides effectively concentrate infrared SPPs.
    • SPP concentration significantly enhances upconversion luminescence intensity.
    • This work demonstrates a method for controlling and enhancing light-matter interactions at the nanoscale.