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(a) Schematic representation of the triangular lattice band diagram showing how the fundamental waveguide mode folds in the two lattice directions and . The ratio of the PhC hole radius to the lattice period is (air filling factor ). Insets: and waveguides (left and right, respectively). (b) Evolution of the band diagram near the point with (from left to right , 40%, and 55%).
factors of the two DFB-like components near the point calculated vs the air filling factor of the PhC. Dashed curves are for the infinite waveguide while solid curves include the influence of the end facet for the finite waveguide . The inset shows the evolutions of the quality factor associated with the facet reflectivity for the two modes. Calculations are performed from a 3D FDTD model.
Emission spectra of waveguide lasers measured for four values of the air filling factors. Dotted curves are used to indicate the wavelength evolutions of the low- and high-frequency DFB components. Insets show scanning electron microscope images of the corresponding PhCs near a waveguide edge.
Light-light characteristics of the , laser measured for four values of the air filling factor. Dots, triangles, and squares are experimental results.
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