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Lasing band-edge identification for a surface-emitting photonic crystal laser

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6 Author(s)
K. Sakai ; Dept. of Electron. Sci. & Eng., Kyoto Univ., Japan ; E. Miyai ; T. Sakaguchi ; D. Ohnishi
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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 Γ-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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IEEE Journal on Selected Areas in Communications  (Volume:23 ,  Issue: 7 )