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首页> 外文会议>International Conference on Photonics, Optics and Laser Technology >The Role of a Discontinuous Free-Electron Density in Harmonic Generation from Metal Surfaces
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The Role of a Discontinuous Free-Electron Density in Harmonic Generation from Metal Surfaces

机译：不连续的自由电子密度在金属表面谐波产生中的作用

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摘要

We discuss a dynamical model of harmonic generation that arises from surfaces that demarcate regions of discontinuous free electron densities. These circumstances can arise from a simple metal mirror, to more complex structures such as layered structures composed of different metals or a metal and a conducting oxide. Using a modified hydrodynamic model we examine the simple case of a metal mirror, assuming the surface is characterized by an electron cloud that spills out into vacuum and shields the internal portions of the remaining medium. We also assess the relative importance of additional nonlinear sources that arise when a free electron discontinuity is present, and show that under the right circumstances both second and third harmonic generation can be very sensitive to the nature, density and thickness of the free electron cloud. Our findings suggest the possibility to control surface harmonic generation through surface charge engineering.
机译：我们讨论了从划分不连续的自由密度区域的表面产生的谐波产生动态模型。这些情况可以从简单的金属镜中出现，以更复杂的结构，例如由不同金属或金属和导电氧化物组成的层状结构。使用改进的流体动力学模型，我们检查了金属镜的简单情况，假设表面的特征在于溢出真空并屏蔽剩余介质的内部部分的电子云。我们还评估了在存在游离电子不连续时出现的附加非线性源的相对重要性，并且表明在第二和第三次谐波产生的正确情况下，对自由电子云的性质，密度和厚度非常敏感。我们的研究结果表明，通过表面电荷工程控制表面谐波产生的可能性。

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