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) Bowtie-shaped nanostructure and its geometric parameters. Incident pump pulse propagates along the direction of purple arrow; the polarization is along the direction of blue arrow. (b) Near-field amplitude spectra for different gap sizes with the amplitude of incident bandwidth pulse normalized to 1, obtained by the Fourier transforming the enhanced field.