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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 21 — Nov. 1, 2010
  • pp: 3691–3693

Free-carrier absorption modulation in silicon nanocrystal slot waveguides

Tim Creazzo, Brandon Redding, Elton Marchena, Shouyuan Shi, and Dennis W. Prather  »View Author Affiliations

Optics Letters, Vol. 35, Issue 21, pp. 3691-3693 (2010)

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Free-carrier absorption (FCA) has proven to be an important obstacle in the development of a silicon-based laser; however, FCA may serve as a potential advantage in active silicon-based switches or modulators. In this work, we present FCA modulation in slot waveguides with silicon nanocrystals (Si-ncs) embedded in SiO 2 as the low-index slot material. Slot waveguides were fabricated with and without Si-ncs, and the presence of Si-ncs was shown to increase the pump-induced FCA loss in the waveguides by a factor of 4.5. We modeled the Si-nc material using a four-level rate equation analysis to estimate the excited population of Si-ncs, allowing us to extract a value of 2.6 × 10 17 cm 2 for the FCA cross section of the Si-nc material.

© 2010 Optical Society of America

OCIS Codes
(230.3120) Optical devices : Integrated optics devices
(230.5590) Optical devices : Quantum-well, -wire and -dot devices
(230.7370) Optical devices : Waveguides
(250.7360) Optoelectronics : Waveguide modulators
(250.6715) Optoelectronics : Switching

ToC Category:
Optical Devices

Original Manuscript: June 17, 2010
Revised Manuscript: September 8, 2010
Manuscript Accepted: September 29, 2010
Published: October 28, 2010

Tim Creazzo, Brandon Redding, Elton Marchena, Shouyuan Shi, and Dennis W. Prather, "Free-carrier absorption modulation in silicon nanocrystal slot waveguides," Opt. Lett. 35, 3691-3693 (2010)

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