Transmission properties and molecular sensing application of CGPW.
Transmission properties and molecular sensing application of CGPW.
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DOI：
10.1364/oe.23.032289
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发表时间：
2015-12
期刊：
影响因子：
3.8
通讯作者：
Jianfeng Yang;Jingjing Yang;W. Deng;F. Mao;Ming Huang
中科院分区：
文献类型：
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作者：
Jianfeng Yang;Jingjing Yang;W. Deng;F. Mao;Ming Huang
本文提出了一种由两条石墨烯带、一个介质芯和一个介质夹层组成的圆柱形石墨烯等离子体波导（CGPW），并研究了其在分子传感中的应用。首先，由这种石墨烯几何形状支持的表面等离子体激元模式的分析模型，并通过有限元方法模拟验证。此外，我们通过改变石墨烯的费米能级、两片之间的耦合距离和圆柱体的半径，证明了模式行为的大的可调谐性。最后，提出了一种基于CGPW的分子传感方案。通过记录传输模式的光谱强度变化，实现了乙醇和甲苯薄层的宽带光谱。由于石墨烯等离子体激元模式的宽带局域化能力，导致在中红外和太赫兹范围内强烈的光-物质相互作用，所提出的传感方案可以提供用于检测纳米尺寸分子的有效方法。
In this paper, a cylindrical graphene plasmon waveguide (CGPW), which consists of two rolled graphene ribbons, a dielectric core and a dielectric interlayer is proposed, and its use for molecular sensing is investigated. First, an analytical model for the surface plasmon modes supported by this graphene geometry is presented and verified by finite element method simulations. Furthermore, we demonstrate a large tunability of the modes behavior by varying the Fermi level of the graphene, the coupling distance between the two sheets and the radius of the cylinder. Finally, a molecular sensing scheme based on the CGPW is proposed. Broadband spectroscopy of ethanol and toluene thin layers is realized by recording the changes in spectral intensity of the propagating mode. Due to the broadband localization capability of graphene plasmon mode which leads to a strong light-matter interaction in the midinfrared and terahertz regime, the proposed sensing scheme may provide an effective way for detecting nanometric-size molecules.