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(Color online) Reflection map of first-order diffraction with Littrow curve (dashed white line) and diffraction cutoff (continuous white line) superimposed. Inset: diffraction geometry.
(Color online) FDTD of W15 active waveguide: lasing spectrum (red) compared to the dispersion diagram. Top inset: photonic crystal waveguide as an open resonator. Oblique arrows show Littrow lasing configuration and vertical arrow shows transverse (FP) lasing. Bottom inset: lasing pattern in the -long W15 PhC waveguide.
(Color online) Fabricated structure: (a) top view of the open resonator formed by a broad 2D PhC waveguide. The black arrows depict the optical path related to the feedback mechanism. (b) Micrographs of the waveguide showing etched PhC cladding holes (left) and top view of the waveguide (right).
(Color online) (a) Measured emission spectra of the electrically pumped W31 waveguide. Peaks are labeled in order of appearance. (b) Calculated TE dispersion diagram of a W31 PhC waveguide.
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