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SEM image of a ridge waveguide ( wide and high) (a), panchromatic CL image showing dark contrast at the ridge (b), and CL spectrum showing the band to band transition emission (c).
Peak wavelength across nonetched ridge structures capped with (a) and (b) dielectric mask stripes of different widths. Solid: , squares: , circles: , and triangles: .
Peak wavelength across ridges etched with a mask, showing the effect of the ridge height, solid: 300 nm, dashed: , and triangles: for ridges wide (a), and ridge width, solid: , squares: , circles: , and triangles: for ridges high (b). The measurements were performed after mask removing.
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