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Hybrid Analytical-Numerical Analysis of Plasmonic Photoconductive Antennas

机译：等离子体电导天线的混合分析-数值分析

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摘要

Photoconductive antennas (PCAs) have extensive technological applications as terahertz sources. Analysis of the performance of these antennas is typically challenging and time-consuming due to complicated interacting photonic and electromagnetic effects in the semiconductor material. The complexity even further increases in plasmonic PCAs because of the existence of periodic structures. In this paper, a numerical-analytical hybrid model is proposed for analysis plasmonic PCAs. Time-dependence and spatial-dependence of the electric field as well as carriers density generated in the semiconductor of plasmonic PCA, are calculated analytically and with finite element method, respectively. The presented model ultimately computes the current generated in the electrodes of plasmonic PCAs. Using this model, the performance of a typical plasmonic PCA as an example is investigated, and model results are validated by measurement results currently existing in the literature; though the model can also be used in the performance analysis of plasmonic PCAs with more complex periodic structures.
机译：光电导天线（PCA）作为太赫兹源具有广泛的技术应用。由于半导体材料中复杂的相互作用的光子和电磁效应，对这些天线的性能进行分析通常具有挑战性和耗时。由于周期性结构的存在，等离子体PCA的复杂性甚至进一步增加。本文提出了一种数值分析混合模型来分析等离子体PCA。分别用解析法和有限元法计算了电场的时间依赖性和空间依赖性以及在等离子体PCA半导体中产生的载流子密度。所提出的模型最终计算出在等离子PCA电极中产生的电流。使用该模型，以典型的等离子PCA为例，研究了其性能，并通过文献中当前存在的测量结果验证了模型结果。尽管该模型还可以用于具有更复杂的周期性结构的等离子PCA的性能分析。

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