Experimental investigation of omnidirectional multiphysics bilayer invisibility cloak with anisotropic geometry

doi:10.1088/1674-1056/acf490

中国物理B ›› 2024, Vol. 33 ›› Issue (3): 38102-038102.doi: 10.1088/1674-1056/acf490

Experimental investigation of omnidirectional multiphysics bilayer invisibility cloak with anisotropic geometry

Huolei Feng(丰火雷)¹, Xingwei Zhang(张兴伟)², Limin Zhou(周利敏)¹, Yuekai Zhang(张悦凯)², and Yushan Ni(倪玉山)^1,†

1 Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China;
2 Key Laboratory of Advanced Ship Materials and Mechanics, College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China

收稿日期:2023-05-07 修回日期:2023-08-17 接受日期:2023-08-29 出版日期:2024-02-22 发布日期:2024-02-29
通讯作者: Yushan Ni E-mail:niyushan@fudan.edu.cn
基金资助:
This work was financially supported by the National Natural Science Foundation of China (Grant No. 11572090) and the Fundamental Research Funds for the Central Universities (Grant No. 3072022GIP0202).

Experimental investigation of omnidirectional multiphysics bilayer invisibility cloak with anisotropic geometry

Huolei Feng(丰火雷)¹, Xingwei Zhang(张兴伟)², Limin Zhou(周利敏)¹, Yuekai Zhang(张悦凯)², and Yushan Ni(倪玉山)^1,†

1 Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China;
2 Key Laboratory of Advanced Ship Materials and Mechanics, College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China

Received:2023-05-07 Revised:2023-08-17 Accepted:2023-08-29 Online:2024-02-22 Published:2024-02-29
Contact: Yushan Ni E-mail:niyushan@fudan.edu.cn
Supported by:
This work was financially supported by the National Natural Science Foundation of China (Grant No. 11572090) and the Fundamental Research Funds for the Central Universities (Grant No. 3072022GIP0202).

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摘要/Abstract

摘要： Thermal-electric bilayer invisibility cloak can prevent the heat flux and electric current from touching the object without distorting the external temperature and electric potential fields simultaneously. In this paper, we design an omnidirectional thermal-electric invisibility cloak with anisotropic geometry. Based on the theory of neutral inclusion, the anisotropic effective thermal and electric conductivities of confocal elliptical bilayer core-shell structure are derived, thus obtaining the anisotropic matrix material to eliminate the external disturbances omnidirectionally. The inner shell of the cloak is selected as an insulating material to shield the heat flux and electric current. Then, the omnidirectional thermal-electric cloaking effect is verified numerically and experimentally based on the theoretical anisotropic matrix and manufactured composite structure, respectively. Furthermore, we achieve the thermal-electric cloaking effect under a specific direction of heat flux and electric current using the isotropic natural materials to broaden the selection range of materials. The method proposed to eliminate anisotropy and achieve the omnidirectional effect could also be expanded to other different physical fields for the metadevices with different functions.

关键词: omni-directionality, multiphysics, bilayer confocal ellipse, invisibility cloak

Abstract: Thermal-electric bilayer invisibility cloak can prevent the heat flux and electric current from touching the object without distorting the external temperature and electric potential fields simultaneously. In this paper, we design an omnidirectional thermal-electric invisibility cloak with anisotropic geometry. Based on the theory of neutral inclusion, the anisotropic effective thermal and electric conductivities of confocal elliptical bilayer core-shell structure are derived, thus obtaining the anisotropic matrix material to eliminate the external disturbances omnidirectionally. The inner shell of the cloak is selected as an insulating material to shield the heat flux and electric current. Then, the omnidirectional thermal-electric cloaking effect is verified numerically and experimentally based on the theoretical anisotropic matrix and manufactured composite structure, respectively. Furthermore, we achieve the thermal-electric cloaking effect under a specific direction of heat flux and electric current using the isotropic natural materials to broaden the selection range of materials. The method proposed to eliminate anisotropy and achieve the omnidirectional effect could also be expanded to other different physical fields for the metadevices with different functions.

Key words: omni-directionality, multiphysics, bilayer confocal ellipse, invisibility cloak

中图分类号: (New materials: theory, design, and fabrication)

81.05.Zx

78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials) 74.25.fc (Electric and thermal conductivity)

Huolei Feng(丰火雷), Xingwei Zhang(张兴伟), Limin Zhou(周利敏), Yuekai Zhang(张悦凯), and Yushan Ni(倪玉山). Experimental investigation of omnidirectional multiphysics bilayer invisibility cloak with anisotropic geometry[J]. 中国物理B, 2024, 33(3): 38102-038102.

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Experimental investigation of omnidirectional multiphysics bilayer invisibility cloak with anisotropic geometry

Experimental investigation of omnidirectional multiphysics bilayer invisibility cloak with anisotropic geometry

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