Free-standing guided-mode resonance humidity sensor in terahertz
Free-standing guided-mode resonance humidity sensor in terahertz
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DOI：
10.1016/j.sna.2017.10.060
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发表时间：
2017-12-01
影响因子：
4.6
通讯作者：
Ok, Gyeongsik
中科院分区：
文献类型：
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作者：
Shin, Hee Jun;Kim, Sae-Hyung;Ok, Gyeongsik
我们从理论和实验上研究了聚合物基导模共振（GMR）结构及其在太赫兹相对湿度（RH）传感中的应用。我们获得了20 ℃下PVA材料涂层的自支撑聚合物GMR传感器的相对湿度依赖的共振频率偏移和透射率变化。利用时域有限差分法对巨磁阻结构进行了同频域数值模拟。结果表明，当相对湿度增加到70%时，聚乙烯醇（PVA）薄膜中的含水量增加到6%。因此，我们提出了一种高灵敏度的RH传感器，它可以通过一个简单的方法，低成本的广泛使用。(C)2017爱思唯尔B.V.保留所有权利。
We theoretically and experimentally investigate a polymer-based guided-mode resonance (GMR) structure and its application for relative humidity (RH) sensing in the terahertz region. We obtained RH-dependent resonance frequency shifts and transmittance changes of the free-standing polymer GMR sensors with PVA material coating at 20 degrees C. We numerically simulated the GMR structure in the same frequency region by using the FDTD method. It shows that the water contents in the polyvinyl alcohol (PVA) film are increased up to 6% as RH is increased up to 70%. As a result, we propose a highly sensitive RH sensor, which can be fabricated by a simple method at low cost for widespread usage. (C) 2017 Elsevier B.V. All rights reserved.