Generation of unipolar half-cycle pulses via unusual reflection of a single-cycle pulse from an optically thin metallic or dielectric layer
Generation of unipolar half-cycle pulses via unusual reflection of a single-cycle pulse from an optically thin metallic or dielectric layer
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DOI：
10.1364/ol.42.002189
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发表时间：
2017-06-01
期刊：
影响因子：
3.6
通讯作者：
Rosanov, N. N.
中科院分区：
文献类型：
--
作者：
Arkhipov, M. V.;Arkhipov, R. M.;Rosanov, N. N.
我们提出了一种非常简单的方法，通过反射一个单周期的光脉冲从一个薄的平面金属或介质层形成近似单极半周期的光脉冲。由于一维脉冲传播的特性，反射中的单极脉冲出现。也就是说，我们表明，由层发射的字段是成比例的介质中的振荡电荷的速度，而不是他们的加速度。此外，可以强制电荷的振荡速度在整个脉冲持续时间内保持恒定的符号。也就是说，超短脉冲从具有纳米级厚度的大面积层的反射可以与较长脉冲和较厚层的情况下的普通反射非常不同。这表明，在完全线性光学系统中，少数周期的光脉冲有可能发生不寻常的变换。(C)2017美国光学学会
We propose a strikingly simple method to form approximately unipolar half-cycle optical pulses via reflection of a single-cycle optical pulse from a thin flat metallic or dielectric layer. Unipolar pulses in reflection arise due to specifics of one-dimensional pulse propagation. Namely, we show that the field emitted by the layer is proportional to the velocity of the oscillating charges in the medium, instead of their acceleration. Besides, the oscillation velocity of the charges can be forced to keep a constant sign throughout the pulse duration. That is, reflection of ultrashort pulses from broad-area layers with nanometer-scale thickness can be very different from the common reflection in the case of longer pulses and thicker layers. This suggests a possibility of unusual transformations of few-cycle light pulses in completely linear optical systems. (C) 2017 Optical Society of America