Ultrafast nonlinear response of AlGaAs two-dimensional photonic crystal waveguides

Bristow, A. D.; Wells, J.-P. R.; Fan, W. H.; Fox, A. M.; Skolnick, M. S.; Whittaker, D. M.; Tahraoui, A.; Krauss, T. F.; Roberts, J. S.
August 2003
Applied Physics Letters;8/4/2003, Vol. 83 Issue 5, p851
Academic Journal
We have used femtosecond pump-probe spectroscopy to study the ultrafast nonlinear response of AlGaAs two-dimensional photonic crystal waveguides in the near-infrared spectral region. The modulation of the reflectivity spectra due to the refractive index change produced by photogenerated carriers was measured. We observed an instantaneous pump-induced shift in the wavelength of a photonic resonance at 882 nm with a fast decay time of ≈8 ps. The magnitude of the reflectivity change was very large at wavelengths close to the photonic resonance, with a maximum value of ΔR/R>30% at 877 nm. These results confirm the excellent potential of photonic crystal waveguides in ultrafast nonlinear switching applications.


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