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The two-color strong-field mixing in gas medium is a widely-used approach togenerate bright broadband terahertz (THz) radiation. Here, we present a new andcounterintuitive method to promote THz performance in two-color scheme. Beyondour knowledge that the maximum THz generation occurs with two-color focioverlapped, we found that, when the foci of two-color beams are noticeablyseparated along the propagation axis resulting in cascading plasmas, the THzconversion efficiency is surged by one order of magnitude and the bandwidth isstretched by more than 2 times, achieving $10^{-3}$ conversion efficiency and$>$100 THz bandwidth under the condition of 800/400 nm, $\sim$35 fs drivinglasers. With the help of the pulse propagation equation and photocurrent model,the observations can be partially understood by the compromise between THzgeneration and absorption due to the spatial redistribution of laser energy incascading plasmas. Present method can be extended to mid-infrared drivinglaser, and the new records of THz peak power and conversion efficiency areexpected.

Intensity-surged and Bandwidth-extended Terahertz Radiation in Two-foci Cascading Plasmas