Abstract
Light can be slowed down by several orders of magnitude in photonic crystals. With a unique phase-sensitive and time-resolved near-field microscope we have observed light fields that have a speed of, at most, c/1000. In addition the photonic band structure of the photonic crystal structure is experimentally determined. Pulses are also tracked while propagating through complex nanophotonic structures, like a directional coupler based on photonic crystal waveguides. We will also show that care has to be taken in slow light applications based on simple photonic crystal structures: higher-order dispersion may lead to significant pulse broadening without proper engineering of the photonic crystal.
© 2006 Optical Society of America
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