Ultrafast Tilting of the Dispersion of a Photonic Crystal and Adiabatic Spectral Compression of Light Pulses
Ultrafast Tilting of the Dispersion of a Photonic Crystal and Adiabatic Spectral Compression of Light Pulses
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DOI：
10.1103/physrevlett.108.033902
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发表时间：
2012-01-18
影响因子：
8.6
通讯作者：
Kampfrath, Tobias
中科院分区：
文献类型：
--
作者：
Beggs, Daryl M.;Krauss, Thomas F.;Kampfrath, Tobias
我们通过理论和实验证明了光子晶体波导在吸收飞秒泵浦脉冲后色散曲线的超快倾斜。通过用纳米阴影掩模塑造泵浦光束的横截面，不同的波导本征模与摄动泵浦获得不同的空间重叠，导致色散的局部平坦化高达11%。我们发现这种偏模扰动可以用来绝热压缩光脉冲通过波导的频谱。
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.