Dots Within Dots May Hit the Spot
Like nested dolls, quantum dots can reside inside microspheres. Quantum dots are a few nanometers in diameter and have bright, size-dependent emission. A single wavelength can be used to excite dots of different sizes, making multiplexing possible. By incorporating many dots into polystyrene or bioconjugated micron-size spheres, researchers can create structures with the potential to confine electrons and photons in three dimensions.
This arrangement could be useful in a number of research...
Photonics Spectra, June 2006