Abstract
We demonstrate polarization mode selection in a two-dimensional (2D) photonic crystal laser by controlling the geometry of the unit cell structure. As the band diagram of the square-lattice photonic crystal is influenced by the unit cell structure, calculations reveal that changing the structure from a circular to an elliptical geometry should result in a strong modification of the electromagnetic field distributions at the band edges. Such a structural modification is expected to provide a mechanism for controlling the polarization modes of the emitted light. A square-lattice photonic crystal with the elliptical unit cell structure has been fabricated and integrated with a gain media. The observed coherent 2D lasing action with a single wavelength and controlled polarization is in good agreement with the predicted behavior.
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- M. Yokoyama S. Noda unpublished data.
- Web figure 1 is available at Science Online at www.sciencemag.org/cgi/content/full/293/5532/1123/DC1.
- Supported in part by a grant-in-aid for scientific research of priority areas from the Ministry of Education Culture Sports Science and Technology of Japan; Kyoto University VBL; and ICF Foundation.