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Silicon nanowire optical waveguide (SNOW).

Mohammadreza Khorasaninejad1, Simarjeet Singh Saini

  • 1Department of Electrical and Computer Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.

Optics Express
|December 18, 2010
PubMed
Summary

We developed a new silicon nanowire optical waveguide that enhances light confinement. This novel structure improves optical interactions for miniaturized photonic devices.

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Area of Science:

  • Photonics
  • Nanotechnology
  • Optical Engineering

Background:

  • Optical waveguides are crucial components in integrated optics.
  • Existing single nanowire waveguides have limitations in optical confinement.
  • Novel structures are needed to improve light manipulation at the nanoscale.

Purpose of the Study:

  • To propose and analyze a novel optical waveguide based on arrays of silicon nanowires.
  • To investigate the optical mode guidance and loss characteristics of the proposed structure.
  • To demonstrate the potential for enhanced optical confinement and efficient light guiding.

Main Methods:

  • Utilizing the Finite Difference Time Domain (FDTD) method to calculate optical radiation loss.
  • Analyzing the effect of electric field polarization on waveguide performance.
  • Approximating the arrayed nanowire region with an effective index bulk waveguide model.

Main Results:

  • The proposed silicon nanowire array waveguide can guide optical modes when the electric field is polarized along the nanowire length.
  • Randomly arranged nanowires show higher scattering loss but can still guide light.
  • High radiation losses occur when the electric field is polarized transversely.
  • An optical confinement factor of 33% was achieved for 50 nm diameter nanowires, significantly higher than single nanowires (0.1%).
  • A radiation loss of 0.12 cm⁻¹ was measured for nanowires spaced 75 nm apart.

Conclusions:

  • The proposed arrayed silicon nanowire waveguide offers significantly enhanced optical confinement compared to single nanowires.
  • The effective index approximation simplifies the design and optimization of these nanoscale optical structures.
  • This novel waveguide design holds promise for advanced integrated photonic devices operating at various wavelengths and with different materials.

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