We report the fabrication and the measurement of microcavities whoseoptical eigenmodes were discrete and were well predicted by using themodel of the photonic dot with perfectly reflected sidewalls. Thesemicrocavities consisted of the semiconductor pillar fabricated bythe simple wet-etched process and successive metal coating.Angle-resolved photoluminescence spectra demonstrate the characteristicemission of the corresponding eigenmodes, its pattern revealed byvarying both polar (θ) and azimuthal Φ angles. It is shownthat the metal-coated sidewalls can provide an efficient way to suppress theemission due to the leaking modes in these pillar microcavities.