论文标题
Gigahertz-terahertz的谐波倍增器中的超级晶格非线性
Superlattice nonlinearities for Gigahertz-Terahertz generation in harmonic multipliers
论文作者
论文摘要
半导体超级晶格是强烈的非线性介质，提供了与高频Gigahertz辐射产生的几种技术挑战，并且非常有效的频率乘法最多可达几个Terahertz。但是，电荷积累，陷阱和界面缺陷导致非线性电流流中明显不对称，高谐波产生茎。这个问题需要在辐射下的不对称电流流动的完全非扰动溶液，我们在本文中在Boltzmann-Bloch方法中提供了该解决方案。我们在频率和时域上研究了非线性输出，并通过调整界面质量来证明偶数谐波的显着增强。此外，与常规敏感性所描述的材料相比，我们发现任意提高输入功率不是对高非线性输出的解决方案。不对称和功率值的复杂组合导致最大的高谐波产生。
Semiconductor superlattices are strongly nonlinear media offering several technological challenges associated with the generation of high-frequency Gigahertz radiation and very effective frequency multiplication up to several Terahertz. However, charge accumulation, traps and interface defects lead to pronounced asymmetries in the nonlinear current flow, from which high harmonic generation stems. This problem requires a full non-perturbative solution of asymmetric current flow under irradiation, which we deliver in this paper within the Boltzmann-Bloch approach. We investigate the nonlinear output on both frequency and time domains and demonstrate a significant enhancement of even harmonics by tuning the interface quality. Moreover, we find that increasing arbitrarily the input power is not a solution for high nonlinear output, in contrast with materials described by conventional susceptibilities. There is a complex combination of asymmetry and power values leading to maximum high harmonic generation.
