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Active terahertz time differentiator using piezoelectric micromachined ultrasonic transducer array

机译:采用压电微机械超声换能器阵列有源太赫兹时间微分器

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摘要

The rapid growth of information technology is closely linked to our ability to modulate and demodulate a signal, whether in the frequency or in the time domain. Recent demonstrations of terahertz (THz) modulation involve active semiconductor metamaterial surfaces or use of a grating-based micromirror for frequency offset tuning. However, a wideband and active differentiator in the THz frequency band is yet to be demonstrated. Here, we propose a simple method to differentiate a THz pulse by inducing tiny phase changes on the THz beam path using a piezoelectric micromachined ultrasonic transducer array. We precisely demonstrate that the modulated THz signal detected after the piezoelectric device is proportional to the first-order derivative of the THz pulse. The proposed technique will be able to support a wide range of THz applications, such as peak detection schemes for telecommunication systems. (C) 2020 Optical Society of America
机译:信息技术的快速增长与我们调制和解调信号的能力密切相关,无论是在频率还是时域中。 Terahertz(THz)调制的最近演示涉及有源半导体超材料表面或使用光栅基微镜进行频率偏移调谐。 然而,尚未说明THz频带中的宽带和有源微分器。 这里,我们提出了一种简单的方法,通过使用压电微机械超声换能器阵列诱导THz光束路径的微小相位变化来区分THz脉冲。 我们精确地证明在压电装置之后检测到的调制的THz信号与THz脉冲的一阶导数成比例。 所提出的技术将能够支持广泛的THZ应用,例如电信系统的峰值检测方案。 (c)2020美国光学学会

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