Pronounced Linewidth Narrowing of Vertical Metallic Split-Ring Resonators via Strong Coupling with Metal Surface

Du, Wei; Zhu, Youcheng; Yan, Zhendong; Xu, Xiulian; Xu, Xiaoyong; Hu, Jingguo; Cai, Pinggen; Tang, Chaojun

doi:10.3390/nano11092194

Open AccessArticle

Pronounced Linewidth Narrowing of Vertical Metallic Split-Ring Resonators via Strong Coupling with Metal Surface

by

Wei Du

^1,2,†,

Youcheng Zhu

^1,†,

Zhendong Yan

^2,3,

Xiulian Xu

¹,

Xiaoyong Xu

¹,

Jingguo Hu

¹,

Pinggen Cai

⁴ and

Chaojun Tang

^4,*

¹

College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China

²

The National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

³

College of Science, Nanjing Forestry University, Nanjing 210037, China

⁴

College of Science, Zhejiang University of Technology, Hangzhou 310023, China

^*

Author to whom correspondence should be addressed.

^†

These authors contributed equally to this work.

Nanomaterials 2021, 11(9), 2194; https://doi.org/10.3390/nano11092194

Submission received: 1 August 2021 / Revised: 22 August 2021 / Accepted: 24 August 2021 / Published: 26 August 2021

(This article belongs to the Special Issue Applications of Nanomaterials in Plasmonic Sensors)

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Abstract

We theoretically study the plasmonic coupling between magnetic plasmon resonances (MPRs) and propagating surface plasmon polaritons (SPPs) in a three-dimensional (3D) metamaterial consisting of vertical Au split-ring resonators (VSRRs) array on Au substrate. By placing the VSRRs directly onto the Au substrate to remove the dielectric substrates effect, the interaction between MPRs of VSRRs and the SPP mode on the Au substrate can generate an ultranarrow-band hybrid mode with full width at half maximum (FWHM) of 2.2 nm and significantly enhanced magnetic fields, compared to that of VSRRs on dielectric substrates. Owing to the strong coupling, an anti-crossing effect similar to Rabi splitting in atomic physics is also obtained. Our proposed 3D metamaterial on a metal substrate shows high sensitivity (S = 830 nm/RIU) and figure of merit (FOM = 377), which could pave way for the label-free biomedical sensing.

Keywords: magnetic plasmon resonances; split-ring resonators; ultranarrow-band hybrid mode; metamaterial

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MDPI and ACS Style

Du, W.; Zhu, Y.; Yan, Z.; Xu, X.; Xu, X.; Hu, J.; Cai, P.; Tang, C. Pronounced Linewidth Narrowing of Vertical Metallic Split-Ring Resonators via Strong Coupling with Metal Surface. Nanomaterials 2021, 11, 2194. https://doi.org/10.3390/nano11092194

AMA Style

Du W, Zhu Y, Yan Z, Xu X, Xu X, Hu J, Cai P, Tang C. Pronounced Linewidth Narrowing of Vertical Metallic Split-Ring Resonators via Strong Coupling with Metal Surface. Nanomaterials. 2021; 11(9):2194. https://doi.org/10.3390/nano11092194

Chicago/Turabian Style

Du, Wei, Youcheng Zhu, Zhendong Yan, Xiulian Xu, Xiaoyong Xu, Jingguo Hu, Pinggen Cai, and Chaojun Tang. 2021. "Pronounced Linewidth Narrowing of Vertical Metallic Split-Ring Resonators via Strong Coupling with Metal Surface" Nanomaterials 11, no. 9: 2194. https://doi.org/10.3390/nano11092194

APA Style

Du, W., Zhu, Y., Yan, Z., Xu, X., Xu, X., Hu, J., Cai, P., & Tang, C. (2021). Pronounced Linewidth Narrowing of Vertical Metallic Split-Ring Resonators via Strong Coupling with Metal Surface. Nanomaterials, 11(9), 2194. https://doi.org/10.3390/nano11092194

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Pronounced Linewidth Narrowing of Vertical Metallic Split-Ring Resonators via Strong Coupling with Metal Surface

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