  We integrate about 100 single Cadmium Selenide semiconductor nanowires in
self-standing Silicon Nitride photonic crystal cavities in a single processing
run. Room temperature measurements reveal a single narrow emission linewidth,
corresponding to a Q-factor as large as 5000. By varying the structural
parameters of the photonic crystal, the peak wavelength is tuned, thereby
covering the entire emission spectral range of the active material. A very
large spectral range could be covered by heterogeneous integration of different
active materials.
