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Polarization Mode Control of Two-Dimensional Photonic Crystal Laser by Unit Cell Structure Design

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Science  10 Aug 2001:
Vol. 293, Issue 5532, pp. 1123-1125
DOI: 10.1126/science.1061738

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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.

  • * To whom correspondence should be addressed. E-mail: snoda{at}kuee.kyoto-u.ac.jp

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