Highly sensitive and tunable terahertz biosensor based on optical Tamm states in graphene-based Bragg reflector

Highly sensitive and tunable terahertz biosensor based on optical Tamm states in graphene-based Bragg reflector
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基于石墨烯布拉格反射器中光学Tamm态的高灵敏度和可调谐太赫兹生物传感器

DOI:
10.1016/j.rinp.2019.102779
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发表时间:
2019-12
期刊:
影响因子:
5.3
通讯作者:
Jianxing Ouyang
Jianxing Ouyang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yunyang Ye;Minzhu Xie;Jiao Tang;Jianxing Ouyang

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利用石墨烯和一维光子晶体的复合结构,提出了一种高灵敏度、可调谐的太赫兹生物传感器。理论分析和仿真结果表明,该传感器的灵敏度和优值分别达到517.9°/RIU和222.9 RIU-1。生物传感器的高灵敏度源于石墨烯基分布式布拉格反射器引起的光学Tamm态的激发。通过改变石墨烯上的电压,我们可以电控制生物传感器的灵敏度和品质因数。此外,我们已经表明,该生物传感器具有广泛的范围(1.40-1.70),用于测量的传感介质的折射率。我们相信这种生物传感器在生物检测领域有着良好的应用前景。
A highly sensitive and tunable biosensor at terahertz (THz) frequencies is proposed by using a composite structure of graphene and one-dimensional photonic crystal. The theoretical analysis and simulation results show that the sensitivity and figure-of-merit of the biosensor can reach 517.9°/RIU and 222.9 RIU-1, respectively. The high sensitivity of the biosensor originates from the excitation of optical Tamm states caused by graphene-based distributed Bragg reflector. By varying the voltage on graphene, we can electrically control the sensitivity and figure-of-merit of the biosensor. Furthermore, we have shown that the biosensor has a wide range (1.40–1.70) for measuring the refractive index of the sensing medium. We believe the biosensor has a good application prospect in the field of biological detection.
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