Laser threshold of polymer cylindrical microresonators

Microcavity lasers are of interest for both fundamental studies of cavity quantum electrodynamics and for potential applications in all-optical networks. Among the different types of microcavities, the microdisk is especially suited for fabricating polymer microcavity lasers. Current research with microdisk lasers has focused on two areas: (1) directional laser emission; and (2) laser threshold minimization. The laser emissions are obtained with optical pumping performed by focusing the pump laser directly on the top face of the microdisks. We present the lasing characteristics of optically pumped luminescent polymer microdisks on semiconductor substrates. Geometrical parameters such as radius disks are shown to affect the lasing threshold.