Ultrathin-film optical coating for angle-independent remote hydrogen sensing
Ultrathin-film optical coating for angle-independent remote hydrogen sensing
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DOI：
10.1088/1361-6501/ab9fd8
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发表时间：
2020-08
影响因子：
2.4
通讯作者：
M. Elkabbash;K. V. Sreekanth;A. Fraiwan;Jonathan Cole;Yunus Alapan;T. Letsou;N. Hoffman;Chunlei Guo-Chu
中科院分区：
文献类型：
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作者：
M. Elkabbash;K. V. Sreekanth;A. Fraiwan;Jonathan Cole;Yunus Alapan;T. Letsou;N. Hoffman;Chunlei Guo-Chu
我们展示了一种光学活性抗反射、吸光光学涂层作为氢气传感器。光学涂层由 60 nm 厚的锗层上的 20 nm 厚的超薄钯膜组成。 Pd 薄膜的超薄厚度 (20 nm) 可减轻机械变形并实现稳健运行。传感器的可测量量是反射最小值的偏移和反射光谱的半峰全宽随氢气浓度的变化。在氢气浓度为 4% 时，反射最小值移动了约 46 nm，半高宽增加了约 228 nm。该传感器表现出出色的灵敏度，对于 0.7% 的氢浓度，波长偏移为 6.5 nm，这比其他纳米光子氢传感方法有显着改进。尽管传感器的响应在循环氢暴露后表现出滞后，但该传感器很坚固，并且在氢脱嵌后其光学响应没有恶化。
We demonstrated an optically-active antireflection, light absorbing, optical coating as a hydrogen gas sensor. The optical coating consists of an ultrathin 20 nm thick palladium film on a 60 nm thick germanium layer. The ultrathin thickness of the Pd film (20 nm) mitigates mechanical deformation and leads to robust operation. The measurable quantities of the sensors are the shift in the reflection minimum and the change in the full width at half maximum of the reflection spectrum as a function of hydrogen gas concentration. At a hydrogen gas concentration of 4%, the reflection minimum shifted by ∼46 nm and the FWHM increased by ∼228 nm. The sensor showed excellent sensitivity, demonstrating a 6.5 nm wavelength shift for 0.7% hydrogen concentration, which is a significant improvement over other nanophotonic hydrogen sensing methods. Although the sensor’s response showed hysteresis after cycling hydrogen exposure, the sensor is robust and showed no deterioration in its optical response after hydrogen deintercalation.