Tunable light sources in the visible and near infrared based on fiber taper coupled photonic crystal nanocavities

Photoluminescence at 1.53 um from Er: SiN
_x
on silicon photonic crystal cavities was extracted via fiber tapers with 2.5 x greater collection efficiency compared to free space emission. Fibers were also used to demonstrate a 10 nm tuning range of 750 nm SHG emission from GaP cavities.