  Highly efficient coupling of photons from nanoemitters into single-mode
optical fibers is demonstrated using tapered fibers. 7.4 +/- 1.2 % of the total
emitted photons from single CdSe/ZnS nanocrystals were coupled into a
300-nm-diameter tapered fiber. The dependence of the coupling efficiency on the
taper diameter was investigated and the coupling efficiency was found to
increase exponentially with decreasing diameter. This method is very promising
for nanoparticle sensing and single-photon sources.
