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We present ultrafast all-optical switching measurements of Si woodpilephotonic band gap crystals. The crystals are spatially homogeneously excited,and probed by measuring reflectivity over an octave in frequency (including thetelecom range) as a function of time. After 300 fs, the complete stop band hasshifted to higher frequencies as a result of optically excited free carriers.The switched state relaxes quickly with a time constant of 18 ps. We present aquantitative analysis of switched spectra with theory for finite photoniccrystals. The induced changes in refractive index are well described by a Drudemodel with a carrier relaxation time of 10 fs. We briefly discuss possibleapplications of high-repetition rate switching of photonic crystal cavities

All-optical octave-broad ultrafast switching of Si woodpile photonic band gap crystals