标题： 纳米结构中的光电流谐波 显示英文标题

标题： Photocurrent-induced harmonics in nanostructures

摘要： 强场下由于电子隧穿电离以及随后的加速过程，气相和固相中均会出现由光电流诱导产生的谐波。与三步谐波发射机制不同，该过程不需要电子返回母离子。我们在此展示出相同机制在金属纳米结构中同样会产生谐波。此外，我们还演示了由于场增强而产生的强局部场梯度如何影响光电流诱导的谐波。这种影响可以揭示出现在连续区中的电子状态，特别是其初始速度。 显示英文摘要

摘要： Photocurrent-induced harmonics appear in gases and solids due to tunnel ionization of electrons in strong fields and subsequent acceleration. In contrast to three-step harmonic emission, no return to the parent ions is necessary. Here we show that the same mechanism produces harmonics in metallic nanostructures in strong fields. Furthermore, we demonstrate how strong local field gradient, appearing as a consequence of the field enhancement, affects photocurrent-induced harmonics. This influence can shed light at the state of electron as it appears in the continuum, in particular, to its initial velocity.