Optical strong coupling in hybrid metal-graphene metamaterial for terahertz sensing

doi:10.1088/1674-1056/abfb58

Abstract We propose a terahertz hybrid metamaterial composed of subwavelength metallic slits and graphene plasmonic ribbons for sensing application. This special design can cause the interaction between the plasmon resonances of the metallic slits and graphene ribbons, giving rise to a strong coupling effect and Rabi splitting. Intricate balancing in the strong coupling region can be perturbed by the carrier concentration of graphene, which is subject to the analyte on its surface. Thereby, the detection of analyte can be reflected as a frequency shift of resonance in terahertz transmission spectra. The result shows that this sensor can achieve a theoretical detection limit of 325 electrons or holes per square micrometer. Meanwhile, it also works well as a refractive index sensor with the frequency sensitivity of 485 GHz/RIU. Our results may contribute to design of ultra-micro terahertz sensors.

Keywords: metamaterial terahertz strong coupling sensor

Received: 04 February 2021
Revised: 20 March 2021
Accepted manuscript online: 26 April 2021

PACS:	87.50.U-
	87.85.fk	(Biosensors)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61865009, 61927813, and 62005168).

Corresponding Authors: Yun Shen
E-mail: shenyun@ncu.edu.cn

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Ling Xu(徐玲), Yun Shen(沈云), Liangliang Gu(顾亮亮), Yin Li(李寅), Xiaohua Deng(邓晓华), Zhifu Wei(魏之傅), Jianwei Xu(徐建伟), and Juncheng Cao(曹俊诚) Optical strong coupling in hybrid metal-graphene metamaterial for terahertz sensing 2021 Chin. Phys. B 30 118702

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Optical strong coupling in hybrid metal-graphene metamaterial for terahertz sensing

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