Response of LiTaO3 thin film to X-band short microwave pulse
Response of LiTaO3 thin film to X-band short microwave pulse
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DOI：
10.1063/1.4994964
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发表时间：
2017-09
影响因子：
4
通讯作者：
Qiong Gao;Honggang Wang;Weidong Qu;Zhongke Jiao;Guolin Li;Juanfeng Wang;Yanxiu Zhang
中科院分区：
文献类型：
--
作者：
Qiong Gao;Honggang Wang;Weidong Qu;Zhongke Jiao;Guolin Li;Juanfeng Wang;Yanxiu Zhang
实验研究了LiTaO_3薄膜探测器对高功率(10W/cm~2量级)、短脉冲(0.1μS量级)X波段脉冲的响应，并从介电弛豫的角度进行了解释。根据探测器的输出电压信号，计算通过LiTaO_3薄膜的电流及其极化，并用它来更基本地检验观测结果。与普通的阶跃激发相比，短脉冲激发可以提供一种三角型激发，其响应更适合于探索相互作用的机理。从能量的角度论证了热释电探测器的响应不是由薄膜温度变化引起的，而薄膜温度变化是传统热释电探测器模型中的核心部件。不同脉冲条件下的极化表明，相互作用是非线性的，因此介电松弛理论中的线性叠加假设不再适用。这是一个发现..。
The response of the LiTaO3 thin film detector to the X-band pulse with large power (of order 10 W/cm2) and short duration (of order 0.1 μs) is investigated experimentally and explained from the viewpoint of dielectric relaxation. With the output voltage signal of the detector, the current through the LiTaO3 thin film and its electric polarization are computed and used to examine the observation in a more fundamental manner. In contrast to the common step excitation, the short pulse can provide a delta-type excitation and the response is more appropriate for exploring the interaction mechanism. It is demonstrated from the viewpoint of energy that the response of the detector is not caused by the temperature change in the film, which is the core component in the traditional model of the pyroelectric detector. The polarizations under different pulse conditions show that the interaction is nonlinear, so the linear superposition assumption in the dielectric relaxation theory cannot be used any more. It is foun...