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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 9 — Apr. 26, 2010
  • pp: 8998–9005

Optical nonlinearities in hydrogenated- amorphous silicon waveguides

Karthik Narayanan and Stefan F. Preble  »View Author Affiliations


Optics Express, Vol. 18, Issue 9, pp. 8998-9005 (2010)
http://dx.doi.org/10.1364/OE.18.008998


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Abstract

We experimentally measure the optical nonlinearities in hydrogenated-amorphous silicon (a-Si:H) waveguides through the transmission of ultra-short pulses. The measured two-photon absorption coefficient β is 4.1 cm/GW and we obtain a 3.5π nonlinear phase shift at 4.1 W coupled input power corresponding to a nonlinear refractive index n2 of 4.2∙10−13 cm2/W. The measured nonlinear coefficient γ = 2003 (W∙m)−1 is at least 5 times the value in crystalline silicon. The measured free carrier absorption coefficient σ = 1.9∙10−16 cm2 agrees with the values predicted from the Drude-Lorenz model. It is seen that a-Si:H exhibits enhanced nonlinear properties at 1550 nm and is a promising platform for nonlinear silicon photonics.

© 2010 OSA

OCIS Codes
(190.4390) Nonlinear optics : Nonlinear optics, integrated optics
(230.4320) Optical devices : Nonlinear optical devices

ToC Category:
Nonlinear Optics

History
Original Manuscript: March 8, 2010
Revised Manuscript: April 11, 2010
Manuscript Accepted: April 12, 2010
Published: April 14, 2010

Citation
Karthik Narayanan and Stefan F. Preble, "Optical nonlinearities in hydrogenated-amorphous silicon waveguides," Opt. Express 18, 8998-9005 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-9-8998


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