Ultrafast tilting of the dispersion of a photonic crystal and adiabatic spectral compression of light pulses
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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.
Beggs , D M , Krauss , T F , Kuipers , L & Kampfrath , T 2012 , ' Ultrafast tilting of the dispersion of a photonic crystal and adiabatic spectral compression of light pulses ' Physical Review Letters , vol 108 , no. 3 , 033902 , pp. - . , 10.1103/PhysRevLett.108.033902
Physical Review Letters
© 2012 American Physical Society
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