High Sensitivity Terahertz Biosensor Based on Mode Coupling of a Graphene/Bragg Reflector Hybrid Structure

Biosensors

Xiaoyu Dai¹  Keqiang Yin²  Yamei Liu²  Shenping Wang²  Qiwen Zheng²  Xiao Zou²  Hongxia Yuan²  Leyong Jiang² 

[1] College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;School of Physics and Electronics, Hunan Normal University, Changsha 410081, China;

关键词: terahertz biosensor;    Tamm plasmons;    mode coupling;    graphene;   

DOI  :  10.3390/bios11100377

来源: DOAJ

【 摘 要 】

In this work, a high-sensitivity terahertz (THz) biosensor is achieved by using a graphene/Bragg reflector hybrid structure. This high-sensitivity THz biosensor is developed from the sharp Fano resonance transmission peak created by coupling the graphene Tamm plasmons (GTPs) mode to a defect mode. It is found that the proposed THz biosensor is highly sensitive to the Fermi energy of graphene, as well as the thickness and refractive index of the sensing medium. Through specific parameter settings, the composite structure can achieve both a liquid biosensor and a gas biosensor. For the liquid biosensor, the maximum sensitivity of $\text{>} 1000 °/\mathrm{RIU}$ is obtained by selecting appropriate parameters. We believe the proposed layered hybrid structure has the potential to fabricate graphene-based high-sensitivity biosensors.

【 授权许可】

Unknown