Unusual Response of Thin LiTaO3 Films to Intense Microwave Pulses
Unusual Response of Thin LiTaO3 Films to Intense Microwave Pulses
复制标题
LiTaO3 薄膜对强微波脉冲的异常响应
DOI：
10.3390/ma12213588
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发表时间：
2019-10
期刊：
影响因子：
3.4
通讯作者：
Lishan Zhao
中科院分区：
文献类型：
--
作者：
Haojia Chen;Qiong Gao;Baoliang Qian;Lishan Zhao
从根本上不同的响应LiTaO3薄膜探测器时，它受到短的微波脉冲的脉冲强度在很宽的范围内改变观察。我们从弱微波脉冲，导致只有微不足道的热释电峰响应。然而，当微波脉冲变得强烈时，通常预期的热释电信号似乎被抑制，并且电压信号的符号甚至可以完全改变。分析表明，虽然传统的热释电模型，这是一个线性模型，并适用于我们的数据在小政权，它不再工作在大信号政权。由于小信号模型是基于热释电效应的电磁波传感器的关键基础，如热释电红外探测器，在这项工作中的观察表明，在强场使用这些设备时应谨慎。此外，相对于激发强度的探测器信号的演变表明，在大信号制度的主要偏振过程发生变化。这对于理解结晶固体如何与强微波相互作用具有根本的重要性。的非线性行为的可能原因进行了讨论。
Fundamentally different responses of a LiTaO3 thin film detector are observed when it is subjected to short microwave pulses as the pulse intensity is altered over a wide range. We start from weak microwave pulses which lead to only trivial pyroelectric peak response. However, when the microwave pulses become intense, the normally expected pyroelectric signal seems to be suppressed and the sign of the voltage signal can even be completely changed. Analysis indicates that while the traditional pyroelectric model, which is a linear model and works fine for our data in the small regime, it does not work anymore in the large signal regime. Since the small-signal model is the key foundation of electromagnetic-wave sensors based on pyroelectric effects, such as pyroelectric infrared detecters, the observation in this work suggests that one should be cautious when using these devices in intense fields. In addition, the evolution of detector signal with respect to excitation strength suggests that the main polarisation process is changed in the large signal regime. This is of fundamental importance to the understanding on how crystalline solids interact with intense microwaves. Possible causes of the nonlinear behaviour is discussed.
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DOI：
10.1186/s41476-017-0060-x
发表时间：
2017-11
影响因子：
1.5
作者：
H. Pinhas;D. Malka;Yossef Danan;M. Sinvani;Z. Zalevsky
通讯作者：
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影响因子：
3.2
作者：
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通讯作者：
H. Burkard;G. Pfister
DOI：
10.1109/tencon.2003.1273139
发表时间：
2003-10
期刊：
TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region
影响因子：
--
作者：
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通讯作者：
M. Jacob;J. Hartnett;J. Mazierska;J. Krupka;M. Tobar