Research progress of femtosecond surface plasmon polariton
Wang Yulong1, Zhao Bo2, Min Changjun1, †, Zhang Yuquan1, Yang Jianjun2, Guo Chunlei2, Yuan Xiaocong1, ‡
       

(a) Apparatus for HHG by electric field enhancement using a nanostructure of bowtie elements and measured spectrum of generated high harmonics.[5] Given the input pulse power of 100 mW, the efficiencies for the harmonics were computed as follows: H7, 2.4 × 10−9; H9, 2.2 × 10−9; H11, 9.5 × 10−10; H13, 9.0 × 10−10; H15, 1.3 × 10−9; and H17, 6.9 × 10−10. (b) Measurement scheme using a transmission-type diffraction grating and a photomultiplier (PM) tube, SEM images of the grating showing the important dimensions and measured spectrum spanning from the 15th (H15) to 43rd (H43) harmonics.[41]