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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Plasmon-enhanced spectral changes in surface sum-frequency generation with polychromatic light.

Luyu Wang1, Franklin Che, Sergey A Ponomarenko

  • 1Department of Electrical and Computer Engineering, Dalhousie University, Halifax, NS, B3J 2X4 Canada.

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We explored spectral shifts in sum-frequency waves from thin metal films using ultrashort pulses. These shifts, near the plasmon coupling angle, are sensitive to incidence angle and pulse bandwidth.

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Area of Science:

  • Nonlinear optics
  • Plasmonics
  • Thin-film optics

Background:

  • The Kretschmann configuration is a standard method for exciting surface plasmon polaritons.
  • Ultrashort coherent pulses enable nonlinear optical phenomena like sum-frequency generation.
  • Understanding spectral behavior is crucial for applications in sensing and spectroscopy.

Purpose of the Study:

  • To theoretically investigate the spectral characteristics of fundamental and sum-frequency waves.
  • To analyze spectral shifts in reflected sum-frequency waves generated from thin metal films.
  • To determine the influence of incidence angle and source spectrum bandwidth on plasmon-enhanced spectral changes.

Main Methods:

  • Theoretical exploration of wave generation and propagation.
  • Utilizing the Kretschmann configuration with coherent ultrashort pulses.
  • Analyzing spectral shifts near the plasmon coupling angle.

Main Results:

  • Pronounced spectral shifts observed in reflected sum-frequency waves.
  • Shifts are prominent when incident fundamental waves approach the plasmon coupling angle.
  • The magnitude of spectral changes is significantly affected by incidence angle and source bandwidth.

Conclusions:

  • Surface plasmon excitation significantly influences the spectral properties of generated nonlinear waves.
  • The observed spectral shifts offer a potential mechanism for optical sensing and characterization.
  • Precise control over incidence angle and pulse bandwidth can tune the plasmon-enhanced spectral response.