| 1 | Continuum electron giving birth to terahertz emission显示文摘The origin of terahertz(THz)generation in a gas-phase medium is still in controversy,although the THz sources have been applied across many disciplines.Herein,the THz generation in a dual color field is investigated experimentally by precisely controlling the relative phase and polarization of dual-color lasers,where the accompanying third-harmonic generation is employed for in situ determination of the relative phase up to sub-wavelength accuracy.Joint studies with the strong approximation(SFA)theory reveal that the continuum-continuum(CC)transition within an escaped electron wave packet in the single atom gives birth to THz emission,without the necessity of considering the plasma effect.Meanwhile,we develop the analytic form from SFA-based CC description,which is able to reproduce and decompose the classical photocurrent model from the viewpoint of microscopic quantum theory,establishing the quantum-lassical correspondence and bringing a novel insight into the mechanism of THz generation.Present studies leave open the possibility for probing the ultrafast dynamics of continuum electrons and a new dimension for the study of THz-related science and methodology. | KAIXUAN ZHANG YIZHU ZHANG XINCHENG WANG TIAN-MIN YAN Y.H.JIANG | 2020 | Photonics Research2020，8，6： | 2 |
您所在的机构暂未开通此部分的功能，请联系管理员