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SEM cross-sectional image of an aperture of . The darker regions represent the oxidized and layers.
Light vs current characteristic curves for devices with different aperture diameter .
Electroluminescence spectra of microcavities with different oxide apertures (aperture diameter is indicated for each spectra). The blueshift of the resonant line and the increased mode separation for smaller diameters are characteristic of strong optical confinement in 3D. The arrows indicate the positions of the modes predicted by the effective index model. The modes indicated on each spectrum are, respectively, from right to left: , , and , according to the standard convention (Ref. 14).
Comparison of the experimental shift of the fundamental cavity resonance (dots) and prediction by the effective index model (continuous line). Inset: cavity quality factor is plotted as a function of the shift in energy with respect to the planar cavity emission.
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