Graphene/Insulator Stack Based Ultrasensitive Terahertz Sensor With Surface Plasmon Resonance

We proposed a terahertz (THz) surface plasmon resonance (SPR) sensor with Kretschmann coupling configuration with buffer layer covered substrate containing doped monolayer graphene (MLG) directly deposited onto the coupling prism. The performance of the SPR sensor in terms of detection accuracy, sen...

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Bibliographic Details
Published in:IEEE photonics journal 2017-12, Vol.9 (6), p.1-11
Main Authors: Huang, Yi, Zhong, Shuncong, Shen, Yaochun, Yao, Ligang, Yu, Yingjie, Cui, Daxiang
Format: Article
Language:English
Subjects:
Couplings
Graphene
Kretschmann coupling configuration
Optical surface waves
Plasmonic Sensor
Plasmons
Sensors
Substrates
Surface waves
Terahertz
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Summary:We proposed a terahertz (THz) surface plasmon resonance (SPR) sensor with Kretschmann coupling configuration with buffer layer covered substrate containing doped monolayer graphene (MLG) directly deposited onto the coupling prism. The performance of the SPR sensor in terms of detection accuracy, sensitivity and figure of merit (FOM) were investigated by applying angular interrogation technique. The results demonstrated that the prism/substrate/graphene coupling structure has higher detection accuracy after coating a low-permittivity buffer layer underneath graphene. Moreover, the sensitivity of sensor could be enhanced using larger refractive index substrate. Furthermore, this proposed structure could effectively overcome the challenge that sample preparation with a small thickness needs to be maintained in Otto geometry based sensor. The results showed the maximum sensitivity of the THz plasmonic sensor up to 49.5 deg/RIU along with a FOM of 8.76 RIU-1. The prominent characteristics of the proposed structure would pave the way for high-performance THz plasmonic sensors.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2017.2765182