  Single-walled carbon nanotubes have advantages as a nanoscale light source
compatible with silicon photonics because they show room-temperature
luminescence at telecom-wavelengths and can be directly synthesized on silicon
substrates. Here we demonstrate integration of individual light-emitting carbon
nanotubes with silicon microdisk resonators. Photons emitted from nanotubes are
efficiently coupled to whispering gallery modes, circulating within the disks
and lighting up their perimeters. Furthermore, we control such emission by
tuning the excitation wavelength in and out of resonance with higher order
modes in the same disk. Our results open up the possibilities of using nanotube
emitters embedded in photonic circuits that are individually addressable
through spectral double resonance.
