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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Published on: November 30, 2012

Broadened phase-matching bandwidth in waveguide-frequency-doubling devices.

Rabi Rabady1

  • 1Electrical Engineering Department, Jordan University of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan. rrabady@just.edu.jo

Applied Optics
|November 26, 2009
PubMed
Summary

Precise phase matching is crucial for frequency doubling in optical waveguides. This study designs two-layer and multi-layer waveguides to achieve phase matching and broaden bandwidth for efficient laser emission.

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Area of Science:

  • Nonlinear Optics
  • Integrated Photonics
  • Materials Science

Background:

  • Second harmonic generation (SHG) in optical planar waveguides offers efficient frequency doubling of laser emission due to light confinement.
  • Achieving SHG requires precise phase matching between fundamental and second-harmonic waves.
  • Fabrication challenges often hinder the precise control needed for phase matching.

Purpose of the Study:

  • To design a two-layer optical waveguide structure for achieving phase matching in SHG.
  • To develop a multi-layer waveguide design for broadening the phase matching bandwidth.
  • To optimize waveguide parameters for efficient frequency conversion.

Main Methods:

  • Simulations of light propagation in layered waveguide structures.
  • Calculation of effective refractive indices for phase matching conditions.
  • Design and optimization of layer thicknesses for specific materials.

Main Results:

  • A basic design for layer thicknesses in a two-layer waveguide was determined to achieve phase matching.
  • A multi-layer waveguide design was proposed to significantly broaden the phase matching bandwidth.
  • The proposed designs offer pathways to overcome fabrication limitations.

Conclusions:

  • Precise phase matching is achievable through careful waveguide design.
  • Multi-layer structures are effective in extending the operational bandwidth for SHG.
  • These designs advance the practical implementation of frequency doubling in integrated photonic devices.