Browsing by Author "Wang, Xiaowei"

Filter results by typing the first few letters
Now showing 1 - 1 of 1
  • Extreme nonlinear strong-field photoemission from carbon nanotubes
    (2019-12-01) Li, Chi; Chen, Ke; Guan, Mengxue; Wang, Xiaowei; Zhou, Xu; Zhai, Feng; Dai, Jiayu; Li, Zhenjun; Sun, Zhipei; Meng, Sheng; Liu, Kaihui; Dai, Qing
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Strong-field photoemission produces attosecond (10−18 s) electron pulses that are synchronized to the waveform of the incident light. This nonlinear photoemission lies at the heart of current attosecond technologies. Here we report a new nonlinear photoemission behaviour—the nonlinearity in strong-field regime sharply increases (approaching 40th power-law scaling), making use of sub-nanometric carbon nanotubes and 800 nm pulses. As a result, the carrier-envelope phase sensitive photoemission current shows a greatly improved modulation depth of up to 100% (with a total modulation current up to 2 nA). The calculations reveal that the behaviour is an interplay of valence band optical-field emission with charge interaction, and the nonlinear dynamics can be tunable by changing the bandgap of carbon nanotubes. The extreme nonlinear photoemission offers a new means of producing extreme temporal-spatial resolved electron pulses, and provides a new design philosophy for attosecond electronics and photonics.