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Microcavity Nonlinear Optics with an Organically Functionalized Surface.

Jin-Hui Chen1, Xiaoqin Shen2, Shui-Jing Tang1,3,4

  • 1State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.

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|November 9, 2019
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Summary
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Organic molecule functionalization dramatically boosts optical nonlinear effects in silica microcavities. This enhancement, observed in third harmonic generation, offers significant potential for optical frequency conversion and surface analysis applications.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science
  • Nonlinear Optics

Background:

  • Ultrahigh-Q silica microcavities exhibit promising optical properties.
  • Functionalization of microcavities can modify their optical response.
  • Organic molecules offer tunable optical properties.

Purpose of the Study:

  • To investigate enhanced optical nonlinear effects on functionalized silica microcavities.
  • To explore third harmonic generation efficiency in molecule-functionalized microcavities.
  • To clarify the pump power dependence of nonlinear signals.

Main Methods:

  • Fabrication of ultrahigh-Q silica microcavities.
  • Functionalization of microcavity surfaces with organic molecules.
  • Measurement of third harmonic generation (THG) efficiency at various pump powers.

Main Results:

  • Maximal THG conversion efficiency reached ~1680%/W², with an absolute efficiency of 0.0144% at 2.90 mW pump power.
  • Achieved efficiency is approximately 4 orders of magnitude higher than in non-functionalized silica microcavities.
  • Elucidated the dependence of THG signal on pump power, resolving previous ambiguities.

Conclusions:

  • Molecule-functionalized microcavities demonstrate significantly enhanced nonlinear optical effects.
  • These findings pave the way for high-efficiency broadband optical frequency conversion.
  • Potential applications include sensitive surface analysis techniques.