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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 9 — Apr. 27, 2009
  • pp: 6982–6995

Novel grating design approach by radiation modes coupling in nonlinear optical waveguides

A. Massaro, R. Cingolani, M. De Vittorio, and A. Passaseo  »View Author Affiliations


Optics Express, Vol. 17, Issue 9, pp. 6982-6995 (2009)
http://dx.doi.org/10.1364/OE.17.006982


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Abstract

In integrated optics the radiation modes represent a negative aspect regarding the propagation of guided modes. They characterize the losses of the substrate region but can contribute to enhance the guided modes by considering the coupling through properly designed gratings arranged at the core/substrate interface. By tailored gratings, the radiation modes become propagating modes and increase the guided power inside the waveguide guiding region. This enhancement is useful especially in low intensity processes such as second harmonic χ(2) conversion process. For this purpose, we analyze accurately the radiation modes contribution in a χ(2) GaAs/AlGaAs nonlinear waveguide where second harmonic signal is characterized by a low power intensity. This analysis considers a new design approach of multiple grating which enhances a fundamental guided mode at λFU =1.55 μm and a codirectional second harmonic guided mode at λSH =0.775 μm. In particular we analyze the second harmonic conversion efficiency by studying the coupling effect of three gratings. The combined effects of the gratings provide an efficient second harmonic field conversion. Design considerations, based on the coupled mode equations analysis, are theoretically discussed. A good agreement between analytical and numerical results is observed.

© 2009 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(310.0310) Thin films : Thin films

ToC Category:
Integrated Optics

History
Original Manuscript: January 7, 2009
Revised Manuscript: February 24, 2009
Manuscript Accepted: March 9, 2009
Published: April 13, 2009

Citation
A. Massaro, R. Congolani, M. De Vittorio, and A. Passaseo, "Novel grating design approach by radiation modes coupling in nonlinear optical waveguides," Opt. Express 17, 6982-6995 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-9-6982


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References

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