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Probing Composite Vibrational Fingerprints in the Terahertz Range with Graphene Split Ring Resonator
IEEE Photonics Journal ( IF 2.4 ) Pub Date : 2020-10-01 , DOI: 10.1109/jphot.2020.3017375
Xinrong Mao , Yanfen Hang , Yuanguo Zhou , Jinfeng Zhu , Qiang Ren , Jianming Zhuo , Yijun Cai

Sensors with single resonant mode often produce false positive when detecting the composite vibrational fingerprints of molecules in the terahertz (THz) range. In this study, a multi-resonant plasmonic structure, consisting of periodic graphene split ring resonator (SRR) arrays, is proposed for THz sensing. The effective detection of ultrathin (0.1 μm) lactose layer is given as an example to demonstrate the detection sensitivity. The vibrational fingerprints of lactose at 0.53 THz and 1.37 THz are enhanced in transmission spectra. Besides, resonant frequencies could be actively adjusted with the gate voltage applied on the SRR array. The physical mechanism of multi-resonance can be explained by a combination of LC resonance and dipole resonance of the structure, which can be observed in the electric field distributions. Moreover, the sensing performance can be further optimized by varying geometric parameters. Furthermore, the refractive index sensing performance of the sensor is also investigated by altering the surrounding medium on the surface. The designed sensor can work under an oblique incidence, which provides potential applications in biological analysis and medical diagnostics.

中文翻译:

用石墨烯裂环谐振器探测太赫兹范围内的复合振动指纹

在检测太赫兹 (THz) 范围内分子的复合振动指纹时,具有单谐振模式的传感器通常会产生误报。在这项研究中,提出了一种由周期性石墨烯裂环谐振器(SRR)阵列组成的多谐振等离子体结构,用于太赫兹传感。以超薄(0.1 μm)乳糖层的有效检测为例,说明检测灵敏度。乳糖在 0.53 THz 和 1.37 THz 的振动指纹在透射光谱中得到增强。此外,谐振频率可以通过施加在 SRR 阵列上的栅极电压进行主动调整。多共振的物理机制可以通过结构的 LC 共振和偶极共振的组合来解释,这可以在电场分布中观察到。而且,通过改变几何参数可以进一步优化传感性能。此外,还通过改变表面周围的介质来研究传感器的折射率传感性能。设计的传感器可以在斜入射下工作,这为生物分析和医学诊断提供了潜在的应用。
更新日期:2020-10-01
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