Generation of isolated attosecond pulses in bowtie-shaped nanostructure with three-color spatially inhomogeneous fields*
Xue Shan, Du Hong-Chuan†, Xia Yue, Hu Bi-Tao‡
       
(a) The ADK ionization rate in two-color field at φ = π , and the classical ionization paths (blue dots) in the field. (b) The HHG spectrum in the two-color field alone and in combination with a 27th harmonic pulse of 1 fs time duration centered at 13.25 T 0. (c) The time–frequency distribution in the three-color homogeneous field.