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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 16 — Jul. 30, 2012
  • pp: 17474–17479

Four-wave mixing in slow light photonic crystal waveguides with very high group index

Juntao Li, Liam O’Faolain, and Thomas F. Krauss  »View Author Affiliations


Optics Express, Vol. 20, Issue 16, pp. 17474-17479 (2012)
http://dx.doi.org/10.1364/OE.20.017474


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Abstract

We report efficient four-wave mixing in dispersion engineered slow light silicon photonic crystal waveguides with a flat band group index of ng = 60. Using only 15 mW continuous wave coupled input power, we observe a conversion efficiency of −28 dB. This efficiency represents a 30 dB enhancement compared to a silicon nanowire of the same length. At higher powers, thermal redshifting due to linear absorption was found to detune the slow light regime preventing the expected improvement in efficiency. We then overcome this thermal limitation by using oxide-clad waveguides, which we demonstrate for group indices of ng = 30. Higher group indices may be achieved with oxide clad-waveguides, and we predict conversion efficiencies approaching −10 dB, which is equivalent to that already achieved in silicon nanowires but for a 50x shorter length.

© 2012 OSA

OCIS Codes
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(260.2030) Physical optics : Dispersion
(130.5296) Integrated optics : Photonic crystal waveguides

ToC Category:
Nonlinear Optics

History
Original Manuscript: May 29, 2012
Manuscript Accepted: July 10, 2012
Published: July 17, 2012

Citation
Juntao Li, Liam O’Faolain, and Thomas F. Krauss, "Four-wave mixing in slow light photonic crystal waveguides with very high group index," Opt. Express 20, 17474-17479 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-16-17474


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