Figure 2
(a) Scanning electron microscopy (SEM) image of a typical pillar with a diameter of 2 μm, along with the normalized electric field intensity distribution \(|\overrightarrow{E}|\) calculated by 3D-FDTD method. (b,c) Photoluminescence images of a 4 μm diameter micropillar with a single quantum dot in the center before (b) and after (c) fabrication. Scale bar represents 2 μm. (d) The average of measured energy (black dot with error bar) of the fundamental mode (HE 11) for the pillar cavities as a function of the designed diameter, which are well described by theory according to Eq. (1) plotted in red line. Inset is a typical experiment cavity mode of a micropillar with a diameter of 4 μm acquired by raising the excitation power.
