%A Xue Shan (薛山), Du Hong-Chuan (杜洪川), Xia Yue (夏月), Hu Bi-Tao (胡碧涛) %T Generation of isolated attosecond pulses in bowtie-shaped nanostructure with three-color spatially inhomogeneous fields %0 Journal Article %D 2015 %J Chin. Phys. B %R 10.1088/1674-1056/24/5/054210 %P 54210-054210 %V 24 %N 5 %U {https://cpb.iphy.ac.cn/CN/abstract/article_117418.shtml} %8 2015-05-05 %X

We theoretically investigate high-order harmonic generation in a two-color multi-cycle inhomogeneous field combined with a 27th harmonic pulse. By considering a bowtie-shaped gold nanostructure, the spatiotemporal profiles of enhanced plasmonic fields are obtained by solving the Maxwell equation using finite-domain time-difference method. Based on quantum-mechanical and classical models, the effect of 27th harmonic pulse, temporal profile of enhanced plasmonic field and inhomogeneity on supercontinuum generation are analyzed and discussed. As a result, broadband supercontinuum can be generated from our approach with optimized gap size of nanostructure. Moreover, these results are not sensitively dependent on the relative phase in the two-color field.