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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 6 — Jun. 1, 2012
  • pp: 1157–1164

Design and analysis of a gallium nitride-on-sapphire tunable photonic crystal directional coupler

Erman Engin, Jeremy L. O’Brien, and Martin J. Cryan  »View Author Affiliations


JOSA B, Vol. 29, Issue 6, pp. 1157-1164 (2012)
http://dx.doi.org/10.1364/JOSAB.29.001157


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Abstract

This paper presents two- and three-dimensional (2D and 3D) finite difference time domain modeling and plane wave expansion results for 2D photonic crystal waveguides in GaN-on-sapphire with an AlN lattice matching layer. The low refractive index contrast between GaN and sapphire restricts operation to above the light line, and losses have been calculated to be in the region of 0.10.3dB/μm, depending on hole depth, which in short devices could be acceptable. A slow-light directional coupler is then designed that has an overall length of 5 μm for 50%–50% coupling at 800 nm. Device tuning is then discussed in terms of both thermo-optic and electro-optic effects, and tuning from 50%–50% to 93%–7% coupling is shown for a 0.1% change in refractive index.

© 2012 Optical Society of America

OCIS Codes
(230.3120) Optical devices : Integrated optics devices
(130.5296) Integrated optics : Photonic crystal waveguides

ToC Category:
Integrated Optics

History
Original Manuscript: October 19, 2011
Revised Manuscript: December 16, 2011
Manuscript Accepted: January 18, 2012
Published: May 3, 2012

Citation
Erman Engin, Jeremy L. O’Brien, and Martin J. Cryan, "Design and analysis of a gallium nitride-on-sapphire tunable photonic crystal directional coupler," J. Opt. Soc. Am. B 29, 1157-1164 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-6-1157

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