  A class of hybrid photonic-plasmonic structures (HPPS) with vertical
cylindrical cavities is proposed and its performance in providing a coherent
light from spontaneous emission is investigated. It is shown that the proposed
easy-to-fabricate and robust anodic aluminum oxide structure dramatically
enhances the temporal and spatial coherence compared to the previously examined
HPPS. The physical mechanism of achieving the temporal and spatial coherence is
explained based on the special optical properties of the proposed HPPS and it
is discussed how this structure enables one adjusting hybrid photonic-plasmonic
optical modes to obtain coherence for emitters of different frequencies.
