Integrated Chemical Vapor Sensor Based on Thin Wall Capillary Coupled Porous Glass Microsphere Optical Resonator.
Integrated Chemical Vapor Sensor Based on Thin Wall Capillary Coupled Porous Glass Microsphere Optical Resonator.
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DOI：
10.1016/j.snb.2015.04.012
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发表时间：
2015-09
期刊：
影响因子：
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通讯作者：
Hanzheng Wang;Lei Yuan;Cheol-Woon Kim;Xinwei Lan;Jie Huang;Yinfa Ma;H. Xiao
中科院分区：
文献类型：
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作者：
Hanzheng Wang;Lei Yuan;Cheol-Woon Kim;Xinwei Lan;Jie Huang;Yinfa Ma;H. Xiao
利用多孔玻璃微球（PGM）作为无介电光学微谐振器，研制了一种小型化化学气相传感器探头。将多孔微球放置在薄壁二氧化硅毛细管内，该毛细管熔融拼接到光纤上。微球的回音壁模式（WGM）是由毛细管薄壁内传播的光的倏逝场激发的。化学气相分子吸附到孔隙中导致PGM的折射率变化，从而导致WGM的共振波长偏移。为了促进化学蒸气分子进入PGM，使用飞秒激光微加工在毛细管的后端打开微窗口。乙醇蒸汽被用来证明化学蒸汽传感探头。该探头具有小型化、集成化和反射式等优点，可应用于环境监测和生物医学传感等领域。
A miniaturized chemical vapor sensor probe was developed using a porous glass microsphere (PGM) as the alignment-free optical microresonator. The porous microsphere was placed inside a thin wall silica capillary tube that was fusion-spliced to an optical fiber. The whispering gallery modes (WGMs) of the microsphere were excited by the evanescent field of the light propagating inside the capillary thin wall. Adsorption of chemical vapor molecules into the pores led to a refractive index change of the PGM and thus the resonance wavelength shift of the WGMs. To facilitate the in-taking of chemical vapor molecules into the PGM, a micro window was opened at the backend of the capillary tube using femtosecond laser micromachining. Ethanol vapor was used to demonstrate the probe for chemical vapor sensing. With a miniaturized size, integrated structure and reflection mode of operation, the proposed probe may find useful in many practical applications such as environmental monitoring and biomedical sensing.