Hydrogen Sensing Using Thin-Film Perfect Light Absorber
Hydrogen Sensing Using Thin-Film Perfect Light Absorber
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DOI：
10.1021/acsphotonics.9b00764
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发表时间：
2019-08-01
期刊：
影响因子：
7
通讯作者：
Strangi, Giuseppe
中科院分区：
文献类型：
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作者：
ElKabbash, Mohamed;Sreekanth, Kandammathe, V;Strangi, Giuseppe
在许多工业，生物医学，环境和能源应用中，氢传感很重要。但是，实现实用，可靠和廉价的氢传感器是一个持续的挑战。在这里，我们根据光学活跃的金属 - 丝线 - 金属（MDM）完美的光吸收器演示了氢感测。该腔体可实现完美的宽带光吸收（> 99.999％），其光损失位于超薄钯（PD）层中。暴露于氢气后，PD层形成氢化物，该氢化物将腔最小反射率波长的主动浓度的最小反射率波长与60 nm相似，氢浓度为4％。传感器的功绩非常高。我们的传感器的易于制造，大面积和高灵敏度使其成为一种有吸引力且实用的选择，尤其是对于对医疗和食品安全应用至关重要的小型氢传感器。
Hydrogen sensing is important in many industrial, biomedical, environmental, and energy applications. Realizing a practical, reliable, and inexpensive hydrogen sensor, however, is an ongoing challenge. Here, we demonstrate hydrogen sensing based on an optically active metal-dielectric-metal (MDM) perfect light absorber. The cavity enables perfect broadband light absorption (>99.999%) with optical losses localized in an ultrathin palladium (Pd) layer. Upon exposure to hydrogen, the Pd layer forms a hydride which actively shifts the cavity minimum reflectance wavelength by similar to 60 nm for a hydrogen concentration of 4%. The sensor enjoys extremely high figure of merit. The ease of fabrication, large area, and high sensitivity of our sensor make it an attractive and practical option, especially for miniaturized hydrogen sensors vital for medical and food safety applications.