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

Barclay, Paul E. and Srinivasan, Kartik and Painter, Oskar (2003) Design of photonic crystal waveguides for evanescent coupling to optical fiber tapers and integration with high-Q cavities. Journal of the Optical Society of America B, 20 (11). pp. 2274-2284. ISSN 0740-3224. http://resolver.caltech.edu/CaltechAUTHORS:BARjosab03

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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.


Item Type:Article
Additional Information:© 2003 Optical Society of America Received November 15, 2002; revised manuscript received July 2, 2003; accepted July 31, 2003 K. Srinivasan thanks the Hertz foundation for financial support.
Record Number:CaltechAUTHORS:BARjosab03
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BARjosab03
Alternative URL:http://www.opticsinfobase.org/abstract.cfm?URI=josab-20-11-2274
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2878
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:04 May 2006
Last Modified:29 Aug 2014 17:09

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