Ultrasensitive Terahertz Biosensors Based on Fano Resonance of a Graphene/Waveguide Hybrid Structure.
Ultrasensitive Terahertz Biosensors Based on Fano Resonance of a Graphene/Waveguide Hybrid Structure.
复制标题
DOI：
10.3390/s17081924
复制
发表时间：
2017-08-21
期刊：
影响因子：
--
通讯作者：
Xiang Y
中科院分区：
文献类型：
--
作者：
Ruan B;Guo J;Wu L;Zhu J;You Q;Dai X;Xiang Y
石墨烯太赫兹（THz）表面等离子体激元为开发THz频率的功能器件提供了希望。通过耦合石墨烯表面等离子体激元（SPPs）和平面波导（PWG）模式，Fano共振实现超灵敏太赫兹生物传感器。通过分析石墨烯表面等离子体与PWG的色散关系，讨论了太赫兹频段的可调谐Fano共振。研究发现，通过改变石墨烯的费米能级可以控制Fano共振的非对称线型，并详细讨论了三明治结构中耦合层和空气层的厚度对Fano共振的影响。然后，我们应用所提出的Fano共振来实现超灵敏的太赫兹生物传感器，结果表明，实现了3260 RIU−1的最高灵敏度。我们的结果是传统的表面等离子体共振传感器的两个订单。此外，我们发现，当敏感介质是在附近的水在太赫兹，灵敏度增加的敏感介质的折射率。
Graphene terahertz (THz) surface plasmons provide hope for developing functional devices in the THz frequency. By coupling graphene surface plasmon polaritons (SPPs) and a planar waveguide (PWG) mode, Fano resonances are demonstrated to realize an ultrasensitive terahertz biosensor. By analyzing the dispersion relation of graphene SPPs and PWG, the tunable Fano resonances in the terahertz frequency are discussed. It is found that the asymmetric lineshape of Fano resonances can be manipulated by changing the Fermi level of graphene, and the influence of the thickness of coupling layer and air layer in sandwich structure on the Fano resonances is also discussed in detail. We then apply the proposed Fano resonance to realize the ultrasensitive terahertz biosensors, it is shown that the highest sensitivities of 3260 RIU−1 are realized. Our result is two orders of a conventional surface plasmon resonance sensor. Furthermore, we find that when sensing medium is in the vicinity of water in THz, the sensitivity increases with increasing refractive index of the sensing medium.
登录
查看更多内容
影响因子：
8.6
作者：
Efetov, Dmitri K.;Kim, Philip
通讯作者：
Kim, Philip
影响因子：
64.8
作者：
Chen, Chi-Fan;Park, Cheol-Hwan;Wang, Feng
通讯作者：
Wang, Feng
影响因子：
4
作者：
Cong, Longqing;Tan, Siyu;Singh, Ranjan
通讯作者：
Singh, Ranjan
影响因子：
2.3
作者：
Hayashi, Shinji;Nesterenko, Dmitry V.;Sekkat, Zouheir
通讯作者：
Sekkat, Zouheir
影响因子：
3.8
作者：
Jepsen, Peter Uhd;Jensen, Jens Kristian;Moller, Uffe
通讯作者：
Moller, Uffe