Highly confined localized spoof plasmon resonance characteristics on space-filling curvilinear meta-structures

Qiao Xiaochen; Shi Tan; Song Shichao; Fu Tao; Li Xiangping; Deng Zilan

doi:10.12086/oee.2022.220037

Article navigation > Opto-Electronic Engineering > 2022 Vol. 49 > No. 9 > 220037

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Qiao X C, Shi T, Song S C, et al. Highly confined localized spoof plasmon resonance characteristics on space-filling curvilinear meta-structures[J]. Opto-Electron Eng, 2022, 49(9): 220037. doi: 10.12086/oee.2022.220037

Citation:

Qiao X C, Shi T, Song S C, et al. Highly confined localized spoof plasmon resonance characteristics on space-filling curvilinear meta-structures[J]. Opto-Electron Eng, 2022, 49(9): 220037. doi: 10.12086/oee.2022.220037

Highly confined localized spoof plasmon resonance characteristics on space-filling curvilinear meta-structures

1.
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonic Technology, Jinan University, Guangzhou, Guangdong 510632, China
2.
Guangxi Key Laboratory of Precision Navigation Technology and Application, Institute of Information and Communication, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China

Fund Project: National Natural Science Foundation of China (62075084), the Natural Science Foundation of Guangdong Province, China (2020A1515010615), the Fundamental Research Funds for the Central Universities of Ministry of Education of China (21620415), and Guangzhou Basic and Applied Basic Research Project ( 202102020566).

More Information

^*Corresponding author: zilandeng@jnu.edu.cn

Received Date 05 April 2022

Revised Date 07 June 2022

Available Online 01 July 2022

Published Date 25 September 2022

Abstract

Abstract

With the advent of the 5G communication era, much attention has been paid to manipulate electromagnetic waves at subwavelength scale. In this paper, we propose comb-shaped meta-structures based on space-filling curves, and use theoretical analysis and numerical simulation method to study the near-field electromagnetic properties of these meta-surfaces. Finally, the effective excitation of all order eigenmodes of spoof localized surface plasmon resonance can be realized in these meta-structures. Through adjusting the structure period to change the effective length of the air waveguide, high compression ratio between resonant wavelength and device size, and high Q-factor can be simultaneously achieved. Moreover, spoof localized surface plasmons excited by space-filling structures are alternately supported by magnetic dipole and electric dipole modes. As a consequence, changing the distribution form of the space-filling curve with the remaining parameters unchanged, the resonant characteristics of the surface plasmon supported by the structure are not affected by the shape tortuosity, but are only related to the total length of the equivalent waveguide. Thus, the space-filling curvilinear structure can be freely designed. We believe that, our results have great potential in designing the high Q-factor miniaturized electromagnetic resonator devices based on spacing-filling curvilinear meta-structure.
- meta-surface /
- localized surface plasmon /
- field resonance enhancement /
- plasmonic waveguides

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References

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Overview

Overview

　 With the advent of the 5G communication era, much attention has been paid to free manipulate electromagnetic waves at a subwavelength scale. Meta-surface with subwavelength structural dimensions have shown broad prospects in the field of microelectronic components due to their powerful electromagnetic control capabilities. In this paper, a subwavelength comb-shaped space-filling meta-surface is designed by using metal curves according to the resonator principle. A series of studies on spoof localized surface plasmon resonance characteristics are carried out on this basis. Theoretical analysis and calculation are carried out according to the structural characteristics. Compared with the traditional meta-surface supporting spoof localized surface plasmons, this curved arrangement of continuous metals will form an air waveguide similar to a resonant cavity, allowing for larger waveguide lengths at smaller dimensions, resulting in greatly reduced working frequency band. Under the excitation of the incident electromagnetic wave, spoof localized surface plasmon like Fabry-Perot resonance will be generated. The resonance frequency of the meta-surface can be calculated from the resonance conditions. Using the finite element method to simulate the 2D comb structure with different periods, it is found that the Q-factor of 1.7×10⁵ can be obtained when the structure compression ratio (λ/L) is 444 by adjusting the structure period. In the study of the higher-order eigenmodes of the comb-shaped space-filled meta-structure, it was found that the spoof localized surface plasmons excited by space-filling structures are alternately supported by magnetic and electric multipoles modes, and the scattering cross-section of the eigenmodes of each order are presented at equally spaced frequencies. By changing the distribution type of the space-filling structure, the supported surface plasmon resonance properties are not affected by the arbitrary bending of the structure, and the magnetic field intensity distribution of the eigenmodes only changes with the direction of the air waveguide. Finally, the 3D simulation of the comb-shaped space-filling structure is carried out, from the X-Z section electric field diagram, it can be observed that the spoof localized surface plasmons generated by the structure can bind the energy on the surface of the structure and generate localized field enhancement. The space-filling design in this paper makes full use of the structure space. This highly localized structure can generate a higher Q-factor under the deep subwavelength structure, and the electromagnetic properties are not affected by the arbitrary bending of the metal structure, and have better stability. It provides a new idea for the preparation of nanometer-sized high-efficiency electromagnetic resonators.