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SEM image of a ringlike photonic crystal waveguide structure with six H1 cavities in the six corners of the structure (R8H1). The lattice parameter is and the is around 0.33.
(a) Spectrum above threshold for a ringlike waveguide structure without cavities on the corners (R8). Inset: below-threshold spectrum. (b) Spectrum above threshold for a ring structure with H1 cavities in the corners (R8H1). Inset: below-threshold spectrum. For both structures and is around .
3D PWE calculation of the photonic bands of the single defect waveguide with , , and . The region above the light line (for , i.e., ) where leaky modes can couple to layer is marked in light gray. The frequency of the measured laser emission for the R8H1 structure is marked with an arrow.
Variation of the spectra above threshold with the value for the coupled-cavity ringlike structures (R8H1). Inset: normalized frequencies of the lasing mode for the R8H1 structures (squares) vs the value. Dashed line: calculated frequencies of the defect level in an H1 cavity. Solid line: calculated frequencies of the even mode of the single defect waveguide at the point of a perfect triangular lattice.
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