超晶格倍频器的研究进展
Recent advances in superlattice frequency multipliers
摘要：
半导体超晶格倍增器作为一种能够在宽频率范围内产生辐射的非线性介质而出现。这种性质有助于适合传感和光谱应用的源的潜力。在这项研究中，我们进一步研究了在不同频率振荡的输入信号激发后超晶格倍增器中谐波产生的后果。在这里，我们提供了一个严格的描述，我们的理论模型，包括半经典玻尔兹曼方法的非线性微带运输和非平衡格林函数计算处理散射过程下的正向和反向偏置。为了充分利用这种辐射源的特点，我们重点研究了弹性散射和超晶格结构中的系统缺陷对非对称电流的影响。
英文摘要：
Semiconductor superlattice multipliers have emerged as a nonlinear medium capable to generate radiation in a wide frequency range. This property facilitates the potential of sources suitable for sensing and spectroscopy applications. In this study, we further investigate the consequences on harmonic generation in a superlattice multiplier after excitation by an input signal oscillating at different frequencies. Here we provide a rigorous description of our theoretical model including a semiclassical Boltzmann approach to nonlinear miniband transport and non-equilibrium Greens functions calculations treating scattering processes under forward and reverse bias. To fully exploit the features of this radiation source, we focus on the effects of elastic scattering and systemat-ic imperfections in the superlattice structure which lead to asymmetric current flow.
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