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Fast Optical Switching

APPLIED PHYSICS
Communication networks that are based on optics must be able to guide light without appreciable losses and to switch the light on and off, ideally at a rapid rate. Although each function can be performed well by individual components, there is a drive for further improvement by seeking an integrated approach where both functions can be achieved by a single component. One path has been to develop semiconductor photonic crystals, where the exceptional light-guiding properties of the photonic crystal are combined with the nonlinear optical properties of the growth material. Bristow et al. use a pump-probe technique to excite a transient nonequilibrium carrier distribution in a two-dimensional photonic crystal made from AlGaAs, and they demonstrate ultrafast photoinduced changes in the reflectivity at a wavelength of 882 nm. The measured response time of less than 10 ps reveals the potential such semiconductor photonic crystals hold for optical communication. — ISO 

Appl. Phys. Lett. 83 , 851 (2003).