25 September 2007 Ultrafast all-optical switching of 3D photonic band gap crystals
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Abstract
We present ultrafast optical switching experiments on 3D photonic band gap crystals. Switching the Si inverse opal is achieved by optically exciting free carriers by a two-photon process. We probe reflectivity in the frequency range of second order Bragg diffraction where the photonic band gap is predicted. We observe a large frequency shift of up to 1.5% of all spectral features including the peak that corresponds to the photonic band gap. We also demonstrate large, ultrafast shifts of stop bands of planar GaAs/AlAs photonic structures. We briefly discuss how our results can be used in future switching and modulation applications.
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T. G. Euser, T. G. Euser, H. Wei, H. Wei, J. Kalkman, J. Kalkman, Y. Jun, Y. Jun, M. Guina, M. Guina, S. Suomalainen, S. Suomalainen, A. Polman, A. Polman, D. J. Norris, D. J. Norris, W. L. Vos, W. L. Vos, } "Ultrafast all-optical switching of 3D photonic band gap crystals", Proc. SPIE 6640, Active Photonic Crystals, 66400G (25 September 2007); doi: 10.1117/12.737495; https://doi.org/10.1117/12.737495
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