The emission of freely propagating terahertz (THz) radiation coming from optical rectification at metallic surfaces has been detected and characterized for the first time to the authors' knowledge. The observed THz transients are induced through nonlinear electronic processes at gold and silver surfaces on intense pulsed optical photoexcitation and exhibit a peak electric field of as much as 200 V/cm. This finding opens a qualitatively new way to investigate nonlinear phenomena at metal surfaces and also can be exploited for the development of new THz emitters.
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机译：据作者所知，这是首次检测到并首次表征了来自金属表面光学整流的自由传播的太赫兹（THz）辐射的发射。观察到的THz瞬变是通过非线性电子过程在强脉冲光光激发下在金和银表面上感应产生的，并且显示出高达200 V / cm的峰值电场。这一发现为研究金属表面的非线性现象提供了一种定性的新方法，也可用于开发新型太赫兹发射器。
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