Hybrid Graphene-Microfiber Waveguide for Chemical Gas Sensing
Hybrid Graphene-Microfiber Waveguide for Chemical Gas Sensing
复制标题
用于化学气体传感的混合石墨烯-微纤维波导
DOI：
10.1109/jstqe.2013.2263117
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发表时间：
2014-01-01
影响因子：
4.9
通讯作者：
Chen, Yuanfu
中科院分区：
文献类型：
--
作者：
Wu, Yu;Yao, Bai-Cheng;Chen, Yuanfu
石墨烯具有许多不同于传统薄膜材料的独特的光学和电学性质，作为新型光子器件和传感器的基础材料，引起了人们极大的兴趣。在本文中，我们提出并展示了一种新的混合石墨烯微光纤波导结构，并首次将其应用于化学气体传感。由于极薄的石墨烯薄膜（<;1 nm）的复折射率容易被分布在其表面的化学气体分子改变，因此横电模式表面波强度对气体浓度敏感。这种由气体分子引起的强度调制可以通过石墨烯波导和微光纤之间的倏逝场耦合来检测。实验测得丙酮蒸气气敏灵敏度为0.31dB/100 ppm，具有良好的可逆性。这种混合波导结构可以为实现各种石墨烯基光子传感器打开新的窗口，在生物学，医学和化学领域具有潜在的应用。
Graphene has been attracting great interest as the basis of novel photonic devices and sensors due to its many unique optical and electric properties that are quite different from conventional film materials. In this paper, we propose and demonstrate a novel hybrid graphene-microfiber waveguide structure and its application to chemical gas sensing for the first time to our knowledge. As the complex refractive index of the extremely thin graphene film (<;1 nm) can be easily modified by chemical gas molecules distributing on its surface, the transverse electric mode surface wave intensity is sensitive to gas concentration. Such an intensity modulation induced by gas molecules can be detected via the coupling of evanescent field between the graphene waveguide and the microfiber. A sensitivity of 0.31 dB/100 ppm and good reversibility are observed experimentally for acetone vapor gas sensing. It is believed that this hybrid waveguide structure could open a new window to realize a variety of graphene-based photonic sensors, for potential applications in the fields of biology, medicine, and chemistry.