Subpicosecond, freely propagating electromagnetic pulse generation and detection using GaAs:As epilayers

@article{Warren1991SubpicosecondFP,
  title={Subpicosecond, freely propagating electromagnetic pulse generation and detection using GaAs:As epilayers},
  author={A. C. Warren and N. Katzenellenbogen and D. Grischkowsky and J. Woodall and M. Melloch and N. Ōtsuka},
  journal={Applied Physics Letters},
  year={1991},
  volume={58},
  pages={1512-1514}
}
Using GaAs epilayers with arsenic precipitates (GaAs:As) as the photoconductive material in a broad‐band optoelectronic terahertz beam system, we have generated and detected freely propagating, subpicosecond electromagnetic pulses. The receiver signal gave a measured integrated pulse width of 0.71 ps. Fast photoconductive rise times have been achieved which are characteristic of good mobility GaAs. In addition, the material exhibits a short ‘‘effective’’ carrier lifetime of several ps due to… Expand
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