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Published May 2003 | Published
Journal Article Open

Efficient excitation of self-collimated beams and single Bloch modes in planar photonic crystals


Using finite-difference time-domain calculations, we investigate out-of-plane coupling between a square-lattice planar photonic crystal and a conventional waveguide located above the photonic crystal. We couple a waveguide oriented in the GX direction to a photonic crystal mode in the second band and show that anticrossing takes place. In this way, a self-collimated beam is launched in the planar photonic crystal, with full power transfer. Furthermore, we investigate the coupling between a waveguide oriented in the GM direction and a photonic crystal and show that single photonic crystal modes can be selectively excited.

Additional Information

© 2003 Optical Society of America. Received October 7, 2002; revised manuscript received December 13, 2002; accepted January 17, 2003. The authors acknowledge funding from the Defense Advanced Research Projects Agency under contract MDA 972-00-1-0019 and from the U.S. Army Research Office under contract DAAD 19-00-1-0392.

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