Measurement of methane concentration with cryptophane E infiltrated photonic crystal microcavity
Measurement of methane concentration with cryptophane E infiltrated photonic crystal microcavity
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DOI：
10.1016/j.snb.2014.12.002
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发表时间：
2015-03
影响因子：
8.4
通讯作者：
Ya‐nan Zhang;Yong Zhao;Qi Wang
中科院分区：
文献类型：
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作者：
Ya‐nan Zhang;Yong Zhao;Qi Wang
利用隐石E对甲烷的选择性吸附特性和光子晶体微腔的优良谐振特性，在隐石E渗透的光子晶体微腔中实现了小型化、高灵敏度、高精度的甲烷浓度测量气体传感器。甲烷浓度的变化会改变渗透到PC微腔缺陷孔中的隐闪石E的折射率，从而引起共振波长的偏移，从而实现甲烷浓度的精确测量。对PC微腔的模拟结果表明，通过增大缺陷孔半径，可以获得363.8nm/RIU的折射率灵敏度、12,923的品质因数和0.9122的透射率，且不需要进行大量的几何调整，加工精度要求也不高。然而，它的谐振特性与其他精细调谐的PC微腔相当。另外，所设计的甲烷传感器只对甲烷进行响应，避免了其他气体的干扰，提高了测量精度。利用微腔的高折射率灵敏度和高品质因数，甲烷传感的理论检测限可达697.35ppm。
A miniaturized,high-sensitive, and high-precision gas sensor for the measurement of methane concentration was realized in a cryptophane E infiltrated photonic crystal (PC) microcavity, by combing selective adsorption property of cryptophane E to methane and excellent resonant property of PC microcavity. The concentration variation of methane would change the refractive index (RI) of cryptophane E that infiltrated in defected holes of PC microcavity, and then induce a shift inresonant wavelength, allowing precision measurement of methane concentration. Simulation results of PC microcavity showed that the RI sensitivity of 363.8 nm/RIU, quality factor of 12,923, and transmission of 0.9122 could be obtained by increasing the radii of defected holes,which does notrequire sophisticategeometrical adjustmentand high-precision requirement for fabrication. However, its resonant property is comparable to other subtle-tunedPC microcavities. Besides, the designed methane sensor is only in response to methane, which can prevent the interrupt of other gases and enhance the measurement accuracy. Benefiting from the high RI sensitivity and high quality factor of the microcavity, a theoretical detection limit of 697.35 ppm for methane sensing can be achieved.