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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 19 — Sep. 13, 2010
  • pp: 20251–20262

Subwavelength grating periodic structures in silicon-on-insulator: a new type of microphotonic waveguide

Przemek J. Bock, Pavel Cheben, Jens H. Schmid, Jean Lapointe, André Delâge, Siegfried Janz, Geof C. Aers, Dan-Xia Xu, Adam Densmore, and Trevor J. Hall  »View Author Affiliations

Optics Express, Vol. 18, Issue 19, pp. 20251-20262 (2010)

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We report on the experimental demonstration and analysis of a new waveguide principle using subwavelength gratings. Unlike other periodic waveguides such as line-defects in a 2D photonic crystal lattice, a subwavelength grating waveguide confines the light as a conventional index-guided structure and does not exhibit optically resonant behaviour. Subwavelength grating waveguides in silicon-on-insulator are fabricated with a single etch step and allow for flexible control of the effective refractive index of the waveguide core simply by lithographic patterning. Experimental measurements indicate a propagation loss as low as 2.1 dB/cm for subwavelength grating waveguides with negligible polarization and wavelength dependent loss, which compares favourably to conventional microphotonic silicon waveguides. The measured group index is nearly constant ng ~1.5 over a wavelength range exceeding the telecom C-band.

© 2010 OSA

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(130.3120) Integrated optics : Integrated optics devices
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Integrated Optics

Original Manuscript: June 10, 2010
Revised Manuscript: August 6, 2010
Manuscript Accepted: August 10, 2010
Published: September 8, 2010

Przemek J. Bock, Pavel Cheben, Jens H. Schmid, Jean Lapointe, André Delâge, Siegfried Janz, Geof C. Aers, Dan-Xia Xu, Adam Densmore, and Trevor J. Hall, "Subwavelength grating periodic structures in silicon-on-insulator: a new type of microphotonic waveguide," Opt. Express 18, 20251-20262 (2010)

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