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Second-order nonlinear silicon-organic hybrid waveguides.

L Alloatti1, D Korn, C Weimann

  • 1Institute of Photonics and Quantum Electronics (IPQ), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany. luca.alloatti@kit.edu

Optics Express
|October 6, 2012
PubMed
Summary

This study introduces a novel silicon-organic hybrid waveguide for efficient second-order nonlinear optics. It demonstrates a practical method for achieving high nonlinear optical mixing in silicon photonics.

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Area of Science:

  • Photonics
  • Nonlinear Optics
  • Materials Science

Background:

  • Silicon photonics typically exhibits weak second-order nonlinear optical effects due to its centrosymmetric crystal structure.
  • Achieving efficient nonlinear optical processes in silicon is crucial for integrated photonic devices, especially for mid-infrared applications.
  • Existing methods often require complex fabrication or exotic materials, limiting practical implementation.

Purpose of the Study:

  • To propose and theoretically analyze a silicon-organic hybrid (SOH) double slot waveguide for enhanced second-order nonlinear optical processes.
  • To achieve mode phase-matching (MPM) for efficient nonlinear frequency conversion in the mid-infrared (mid-IR) spectrum.
  • To demonstrate the potential for efficient second-order nonlinear optical mixing using standard silicon photonic technology.

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Main Methods:

  • Dispersion engineering of a silicon-organic hybrid (SOH) double slot waveguide structure.
  • Theoretical modeling and simulation of nonlinear optical propagation and frequency conversion.
  • Calculation of predicted optical gain based on material nonlinearity and waveguide parameters.

Main Results:

  • The proposed SOH double slot waveguide is dispersion-engineered for effective mode phase-matching (MPM).
  • A high predicted gain of 14.7 dB/cm is achieved for a 3100 nm signal with 20 dBm pump power at 1550 nm.
  • The structure leverages a cladding nonlinearity of χ(2) = 230 pm/V for efficient nonlinear optical mixing.

Conclusions:

  • This research presents a viable concept for realizing efficient second-order nonlinear optical processes in silicon photonics.
  • The developed SOH waveguide technology enables efficient nonlinear optical mixing, a significant advancement for integrated photonics.
  • This work paves the way for utilizing standard silicon photonic technology for high-performance nonlinear optical applications in the mid-IR range.