High-efficiency optical modulation of a terahertz pulse transmitted through aligned silver nanowires on a silicon substrate is demonstrated. Without optical excitation, the terahertz pulses mostly pass through the silver nanowires. However, an optically excited sample significantly modulates the transmittance compared with an excited silicon substrate. The enhanced modulation efficiency is explained by the redistribution effect of photo-carriers due to the nanowires. The simple structure of metal nanowires on a semiconductor substrate could be useful in implementing optically tunable terahertz wave modulators.

中文翻译：

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Si衬底上对准的Ag纳米线的高效光学太赫兹调制

展示了通过硅衬底上对齐的银纳米线传输的太赫兹脉冲的高效光学调制。在没有光激发的情况下，太赫兹脉冲主要通过银纳米线。然而，与激发的硅衬底相比，光学激发的样品显着调节了透射率。增强的调制效率可以通过纳米线引起的光载流子的再分布效应来解释。半导体衬底上金属纳米线的简单结构可用于实现光学可调太赫兹波调制器。