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(a) SEM image showing a micropillar with a diameter of prior to planarization with BCB. (b) Top view of a fully processed device showing the uncapped upper surface of the micropillar at the center of the ring shaped Au contact. (c) Schematic view of an electrically driven micropillar device.
-PL spectrum of an optically pumped (a) and -EL spectrum of an electrically driven (b) micropillar cavity with a diameter of . (c) Cavity factors for micropillars with diameters between 1 and ; open squares (solid circles) show the values of optically pumped (electrically driven) pillars, respectively. (d) Input-output characteristics of an electrically pumped micropillar in log-log scale.
(a) Temperature dependent -EL spectra of a diameter micropillar with a factor of 13.000. Resonance between the QD exciton and the cavity mode is observed at a temperature of . (b) Integrated intensity of the QD exciton vs detuning. Modeling the experimental data yields a Purcell factor of about 10.
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