Optical strong coupling in hybrid metal-graphene metamaterial for terahertz sensing |
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| Affiliation: | 1.Department of Physics, Nanchang University, Nanchang 330031, China;2.School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;3.Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China;4.Shanghai Institute of Microsystem and Information, Chinese Academy of Sciences, Shanghai 200050, China |
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| 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. |
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| Keywords: | metamaterial terahertz strong coupling sensor |
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