Advanced Research Center for Beam Science, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo, Kyoto 606-8502, Japan.
Phys Rev E. 2018 Feb;97(2-1):023204. doi: 10.1103/PhysRevE.97.023204.
We have demonstrated that a pulsed electromagnetic wave (Sommerfeld wave) of subterahertz frequency and 11-MV/m field strength can be induced on a metal wire by the interaction of an intense femtosecond laser pule with an adjacent metal foil at a laser intensity of 8.5×10^{18}W/cm^{2}. The polarity of the electric field of this surface wave is opposite to that obtained by the direct interaction of the laser with the wire. Numerical simulations suggest that an electromagnetic wave associated with electron emission from the foil induces the surface wave. A tungsten wire is placed normal to an aluminum foil with a gap so that the wire is not irradiated and damaged by the laser pulse, thus making it possible to generate surface waves on the wire repeatedly.
我们已经证明，在激光强度为 8.5×10^{18}W/cm^{2}时，通过强飞秒激光脉冲与相邻金属箔的相互作用，可以在金属丝上感应出亚太赫兹频率和 11MV/m 场强的脉冲电磁波（ Sommerfeld 波）。该表面波的电场极性与激光直接与金属丝相互作用时获得的极性相反。数值模拟表明，与箔片中电子发射相关的电磁波会感应出表面波。钨丝垂直于铝箔放置，其间留有间隙，从而使激光脉冲不会辐照和损坏金属丝，因此可以在金属丝上反复产生表面波。
