Ultrafast tilting of the dispersion of a photonic crystal and adiabatic spectral compression of light pulses |
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Authors: | Beggs Daryl M Krauss Thomas F Kuipers L Kampfrath Tobias |
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Affiliation: | FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands. |
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Abstract: | We demonstrate, by theory and experiment, the ultrafast tilting of the dispersion curve of a photonic-crystal waveguide following the absorption of a femtosecond pump pulse. By shaping the pump-beam cross section with a nanometric shadow mask, different waveguide eigenmodes acquire different spatial overlap with the perturbing pump, leading to a local flattening of the dispersion by up to 11%. We find that such partial mode perturbation can be used to adiabatically compress the spectrum of a light pulse traveling through the waveguide. |
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