Cross-wavelength invisibility integrated with various invisibility tactics

Xu, Su; Dong, Fu-Yan; Guo, Wenrui; Han, Dongdong; Qian, Chao; Gao, Fei; Su, Wenming; Chen, Hongsheng; Sun, Hong–Bo

doi:10.1126/sciadv.abb3755

Cited by 34 publications

(16 citation statements)

References 53 publications

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“…2(a). Since the periodicities of metal meshes are usually far smaller than the wavelength of interest at microwave regime, effective medium theory (EMT) can be used for theoretically deriving the low-frequency electric conductivity or sheet resistance of the metal meshes [39,40]. The sheet resistance of a homogeneous film can be derived as R s = ρ/t, where ρ and t are the resistivity and thickness of the conductive film, respectively.…”

Section: Design and Simulationmentioning

confidence: 99%

Optically Transparent Microwave Shielding Hybrid Film Composited by Metal Mesh and Graphene

Wang¹,

Wang²,

Ren³

et al. 2021

PIER

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Transparent conducting materials with the ability of broadband electromagnetic shielding have a widespread range of applications in aerospace, medical equipment, and electronic communications. Achieving enhanced electromagnetic shielding effect without sacrificing much optical transparency is the technical trend in both academia and industries. Here, we experimentally propose a flexible hybrid film constructed by nano-printing based metal meshes and a graphene coating for the transparent electromagnetic shielding application. Numerical analysis is carried out to investigate optimal balance between electromagnetic shielding and optical transparency. In the experiment, enhanced shielding ability of hybrid film is observed without excessively sacrificing optical transmittance, compared to the reference group (the case only with metal mesh). Our work provides a hybrid platform for the high-performance optically transparent shielding materials for electromagnetic environment safety protection.

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Section: Design and Simulationmentioning

confidence: 99%

Optically Transparent Microwave Shielding Hybrid Film Composited by Metal Mesh and Graphene

Wang¹,

Wang²,

Ren³

et al. 2021

PIER

Self Cite

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“…Surface-enhanced Raman spectroscopy (SERS) is an optical technique for molecule identification [1][2][3][4][5] and shows distinguished advantages in chemical and biological analytics [6][7][8][9][10]. Particularly, SERS can obtain a molecular fingerprint with high selectivity and sensitivity in a non-destructive manner [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser Structuring for Flexible Surface-Enhanced Raman Spectroscopy Substrates

Fang

Zhang

et al. 2021

IEEE Photonics J.

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Surface-enhanced Raman spectroscopy (SERS) is an optical technique for molecule identification. However, fabrication of flexible and structured SERS substrates for performance improvement in a facile and cost-effective manner is challenging. In this work, we reported a polytetrafluoroethylene (PTFE)-based flexible SERS substrate by femtosecond laser direct writing (FsLDW) technology. The femtosecond laser-treated PTFE surface is 3D hierarchical micro-/nano-structures, and the structured PTFE-based SERS chip shows excellent performance enhancement. As a result, 10 −7 M can be detected, which shows excellent potentials in developing flexible SERS for wearable electronics.

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“…Even if the circular waveguide is optically transparent, its large size leads to a thick structure (at least 15 cm), therefore making it difficult to install on an optical window. Conversely, transparent electrodes (TEs), such as indium tin oxide (ITO) 8 , graphene 9 , carbon nanotubes (CNTs) 10 , metallic nanowires (MNWs) 11 , and metal mesh film (MMF) 8 , 12 , have also been studied because of their favorable OT and thin-film structure. However, these TEs show a low shielding performance compared with the requirement of EMP applications.…”

Section: Introductionmentioning

confidence: 99%

Optically transparent and very thin structure against electromagnetic pulse (EMP) using metal mesh and saltwater for shielding windows

Phan

Jung

2021

Sci Rep

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An electromagnetic pulse (EMP) with high energy can damage electronic equipment instantly within a wide range of thousands of kilometers. Generally, a metal plate placed inside a thick concrete wall is used against an EMP, but it is not suitable for an EMP shielding window, which requires not only strong shielding effectiveness (SE) but also optical transparency (OT). In this paper, we propose a very thin and optically transparent structure with excellent SE for EMP shielding window application. The proposed structure consists of a saltwater layer held between two glass substrates and two metal mesh layers on the outside of the glass, with a total thickness of less than 1.5 cm. The SE and OT of the structure are above 80 dB and 45%, respectively, which not only meet the requirement of EMP shielding for military purposes but also retain the procedure of good observation. Moreover, the OT of the structure can be significantly improved using only one metal mesh film (MMF) layer, while the SE is still maintained high to satisfy the required SE for home applicants. With the major advantages of low cost, optical transparency, strong SE, and flexible performance, the proposed structure can be considered a good solution for transparent EMP shielding windows.

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Cross-wavelength invisibility integrated with various invisibility tactics

Cited by 34 publications

References 53 publications

Optically Transparent Microwave Shielding Hybrid Film Composited by Metal Mesh and Graphene

Optically Transparent Microwave Shielding Hybrid Film Composited by Metal Mesh and Graphene

Femtosecond Laser Structuring for Flexible Surface-Enhanced Raman Spectroscopy Substrates

Optically transparent and very thin structure against electromagnetic pulse (EMP) using metal mesh and saltwater for shielding windows

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