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Updated: May 29, 2026

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Direction-dependent optical modes in nanoscale silicon waveguides.

Jacob T Robinson1, Michal Lipson

  • 1School of Electrical and Computer Engineering, Cornell University, Ithaca, NY 14853, USA.

Optics Express
|September 22, 2011
PubMed
Summary

Counter-propagating waves in nanoscale waveguides exhibit unique spatial near-field profiles. This distinctiveness enables the development of integrated devices for selective light attenuation in silicon photonics.

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Area of Science:

  • Photonics
  • Optics
  • Materials Science

Background:

  • High-index-contrast nanoscale waveguides are crucial for integrated photonic circuits.
  • Understanding the behavior of counter-propagating waves is essential for device design.
  • Distinct spatial near-field profiles of these waves have not been fully characterized.

Purpose of the Study:

  • To demonstrate that counter-propagating waves in high-index-contrast nanoscale waveguides possess distinct spatial near-field profiles.
  • To utilize this phenomenon for designing an integrated photonic device.

Main Methods:

  • Transmission-based near-field scanning optical microscopy (TraNSOM) was employed.
  • Near-field intensity distributions of counter-propagating modes in a single-mode silicon waveguide were mapped.

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  • An integrated device was designed and simulated based on the observed phenomenon.

    • Main Results:

    • Unique near-field intensity distributions of counter-propagating modes were identified and mapped.
    • A 45 µm integrated device was designed and simulated.
    • The device demonstrated selective attenuation of reflected light with -3.6 dB insertion loss.
    • An extinction ratio greater than -20 dB was achieved.

    Conclusions:

    • Counter-propagating waves in nanoscale waveguides have distinct spatial near-field profiles.
    • This phenomenon can be exploited to create efficient integrated photonic devices for light control.
    • The developed device shows promise for applications requiring precise optical signal management.