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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Published on: December 3, 2013

Surface-enhanced nonlinear four-wave mixing.

Jan Renger1, Romain Quidant, Niek van Hulst

  • 1ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain.

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

We discovered nanostructured gold surfaces exhibit a strong third-order nonlinear response, enabling efficient frequency conversion. This breakthrough enhances nanophotonics and active plasmonics applications.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Nonlinear Optics

Background:

  • Third-order nonlinear optical phenomena are crucial for advanced photonic applications.
  • Efficient frequency conversion is essential for developing novel optical devices.

Purpose of the Study:

  • To investigate the third-order nonlinear response of nanostructured gold surfaces.
  • To explore the potential of these surfaces for enhanced frequency conversion via four-wave mixing (4WM).

Main Methods:

  • Utilizing two incident laser beams with distinct frequencies (omega{1} and omega{2}).
  • Analyzing the generation of four-wave mixing (4WM) fields at frequencies 2omega{1}-omega{2} and 2omega{2}-omega{1}.
  • Investigating the conversion of evanescent energy to propagating radiation by nanostructured surfaces.

Main Results:

  • Demonstrated a particularly strong third-order nonlinear response from nanostructured gold.
  • Showcased that the nonlinear response can be purely evanescent, with surfaces converting it to propagating radiation.
  • Observed that the emitted 4WM radiation is directional, polarized, coherent, and tunable in frequency and angle.

Conclusions:

  • Nanostructured gold surfaces offer efficient frequency conversion in reduced dimensions.
  • This capability opens new avenues for nanophotonics and active plasmonics.
  • The tunable and directional nature of the emitted radiation is key for future device integration.