Lasing band-edge identification for a surface-emitting photonic crystal laser |
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Authors: | Sakai K. Miyai E. Sakaguchi T. Ohnishi D. Okano T. Noda S. |
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Affiliation: | Dept. of Electron. Sci. & Eng., Kyoto Univ., Japan; |
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Abstract: | The possibility of single-mode oscillation over a large cavity area for photonic crystal lasers emitting at the photonic band edge has resulted in much interest in such materials for new forms of solid-state laser. In this paper, we measure the photonic bandstructure in our sample and identify the lasing band edge. By mapping out the bandstructure at the /spl Gamma/-point, we have observed fine structure at the band edge. The experimental results are in good agreement with the theoretically predicted bandstructure. Above threshold, we observe a lasing peak at 965 nm at one of the band edges. The far-field distribution of the laser is measured, showing an annular profile and azimuthal polarization. Calculations on the far-field distribution at the lasing band edge suggest the annular profile is due to an anti-symmetric resonant mode. |
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