  We demonstrate a simple and rapid epoxy-based method for transferring
photonic crystal cavities to the facets of optical fibers. Passive Si cavities
were measured via fiber taper coupling as well as direct transmission from the
fiber facet. Active quantum dot containing GaAs cavities showed
photoluminescence that was collected both in free space and back through the
original fiber. Cavities maintain a high quality factor (2000-4000) in both
material systems. This new design architecture provides a practical
mechanically stable platform for the integration of photonic crystal cavities
with macroscale optics and opens the door for novel research on fiber-coupled
cavity devices.
