title: Role of resonance absorption in terahertz radiation generation from solid targets.
abstract: The interaction of 100-fs laser pulses with solid targets at laser intensities 10(16)-10(18)W/cm(2) has been investigated experimentally by simultaneous measurements of terahertz (THz) and second harmonic signals. THz yield at the front side of the target, which rises from the self-organized transient electron currents along the target surface, is found scaling linearly with the laser intensity basically. Measurements of specularly reflected light spectrum show clear evidence of resonance absorption. The positive effects of resonance absorption on surface current and THz radiation generation have been confirmed by two-dimensional (2D) particle-in-cell (PIC) simulations and angular-dependent experiments, respectively.
authors.forename: Chun
authors.initials: C
authors.lastname: Li
authors.forename: Yun-Qian
authors.initials: YQ
authors.lastname: Cui
authors.forename: Mu-Lin
authors.initials: ML
authors.lastname: Zhou
authors.forename: Fei
authors.initials: F
authors.lastname: Du
authors.forename: Yu-Tong
authors.initials: YT
authors.lastname: Li
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Wang
authors.forename: Li-Ming
authors.initials: LM
authors.lastname: Chen
authors.forename: Zheng-Ming
authors.initials: ZM
authors.lastname: Sheng
authors.forename: Jing-Long
authors.initials: JL
authors.lastname: Ma
authors.forename: Xin
authors.initials: X
authors.lastname: Lu
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang