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(a) Dispersion relation of the designed photonic crystal slab with the waveguide calculated by 3D-FDTD. There are three points with zero group velocity, A, B, and C. Inset shows a schematic image of the waveguide. (b) Time-averaged Poynting vector distribution around the waveguide at B at the center of the slab. (c) Time-averaged Poynting vector distribution around the waveguide at B in the plane normal to slab at the center of (b). The waveguide direction is normal to the plane and the gray scale shows perpendicular component of the Poynting vector. Note that time-averaged Poynting vector becomes zero everywhere at or .
(a) (b) Bird’s-eye view SEM images of a fabricated device.
Laser emissions observed from the direction normal to the slabs. Dotted rectangles show the photonic crystal regions with waveguides. Bright spot seen in the center of the waveguide is the excitation spot. (a) Emission from the whole waveguide. The operation point is considered to be around C in Fig. 2(a). (b) Emission from the facets of the waveguide. The operation point is considered to be around B in Fig. 2(a).
Lasing spectra with various excitation powers. (a) and (b) correspond to Figs. 3(a) and 3(b), respectively. Inset shows characteristic of the mode with lowest threshold power.
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