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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 20, Iss. 11 — Nov. 1, 2003
  • pp: 2274–2284

Design of photonic crystal waveguides for evanescent coupling to optical fiber tapers and integration with high-Q cavities

Paul E. Barclay, Kartik Srinivasan, and Oskar Painter  »View Author Affiliations


JOSA B, Vol. 20, Issue 11, pp. 2274-2284 (2003)
http://dx.doi.org/10.1364/JOSAB.20.002274


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Abstract

We describe a novel scheme based on evanescent guided-wave coupling for optically interfacing between conventional fiber-optic and planar photonic crystal devices such as waveguides and resonant cavities. By considering the band structure of bulk photonic crystal slabs, we analyze the k space properties of a linear defect waveguide and establish a set of design rules to ensure efficient evanescent coupling with optical fiber tapers. These rules are used to design a waveguide in a square-lattice photonic crystal. The coupling efficiency is calculated with a coupled-mode theory incorporating the finite-difference time-domain-calculated uncoupled modes of the fiber taper and photonic crystal waveguide. On the basis of this coupled-mode theory, 95% power transfer from the fiber taper to the photonic crystal waveguide is possible over a coupling length of 80 lattice periods and with a bandwidth of 1.5% of the center wavelength. The integration of this waveguide with a photonic crystal defect resonant cavity is also presented, thus showing the usefulness of the combined fiber taper and photonic crystal waveguide system for efficient, optical fiber-based probing of optical elements based on planar photonic crystal technologies.

© 2003 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(230.7370) Optical devices : Waveguides

Citation
Paul E. Barclay, Kartik Srinivasan, and Oskar Painter, "Design of photonic crystal waveguides for evanescent coupling to optical fiber tapers and integration with high-Q cavities," J. Opt. Soc. Am. B 20, 2274-2284 (2003)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-20-11-2274

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