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‡
       
Harmonic spectra (a), (c), (e) and the corresponding time–frequency distributions (b), (d), (f) of different gap sizes in the two-color inhomogeneous field combined with 27th harmonic pulse at φ = π .