Experimental demonstration of ultra-large-scale terahertz all-dielectric metamaterials

Bi, Ke; Yang, Daquan; Chen, Jia; Wang, Qingmin; Wu, Huayong; Lan, Chuwen; Yang, Yuchen

doi:10.1364/prj.7.000457

Cited by 90 publications

(32 citation statements)

References 45 publications

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“…For instance, in the terahertz region, a recently developed micro-template-assisted self-assembly method, [44] which has the advantage of large-scale and high-precision, could possibly contribute to the fabrication of the oligomer structures proposed here. It is found that toroidal dipole resonances become much narrower than those surrounded by homogeneous air background, and the resonance wavelengths are redshifted (see Supporting Information for details).…”

Section: Hexamer Casementioning

confidence: 99%

Toroidal Dipole Resonances in All‐Dielectric Oligomer Metasurfaces

Zhang

Lan

Gao

et al. 2019

Advcd Theory and Sims

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Dynamic toroidal multipoles have been attracting an increasing amount of attention, thanks to their unique electromagnetic properties. The concept bears great promises in the field of optical sensing as well as electromagnetic energy localization. Metal-based structures with specific designs have been widely adopted to obtain toroidal responses. However, applications for such structures are often hindered by the significant intrinsic loss when it comes to optical frequencies. Here, several configurations of all-dielectric metasurfaces, in which the meta-molecules are composed of disk oligomers (trimer, quadrumer, pentamer, and hexamer), are proposed to support toroidal dipole resonances in the near-infrared waveband when the polarization of the normally incident excitation plane wave is directed to one of the symmetry axes of the oligomers. Multipole expansion including the toroidal dipole term along with near-field electromagnetic patterns confirms the existence of strong toroidal dipolar responses within certain wavelength ranges. This work would enrich the diversity of the all-dielectric optical systems with toroidal dipole resonances.

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Section: Hexamer Casementioning

confidence: 99%

Toroidal Dipole Resonances in All‐Dielectric Oligomer Metasurfaces

Zhang

Lan

Gao

et al. 2019

Advcd Theory and Sims

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“…The emergence of metamaterials breaks the natural materials' constraint and brings an unprecedented opportunity to fully control the electromagnetic waves (EMWs) from microwave to optical frequencies, including polarization, phase, and amplitude. [2][3][4][5] Polarization, a basic characteristic of EMW, conveys valuable information and serves as a cornerstone in many optical phenomena. Manipulating the polarization of EMWs is vital to numerous applications from signal communication, spectroscopy to microscopy.…”

Section: Introductionmentioning

confidence: 99%

High-performance bifunctional polarization switch chiral metamaterials by inverse design method

et al. 2019

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Multifunctional polarization controlling plays an important role in modern photonics, but their designs toward broad bandwidths and high efficiencies are still rather challenging. Here, by applying the inverse design method of model-based theoretical paradigm, we design cascaded chiral metamaterials for different polarization controls in oppositely propagating directions and demonstrate their broadband and high-efficiency performance theoretically and experimentally. Started with the derivation of scattering matrix towards specified polarization control, a chiral metamaterial is designed as a meta-quarter-wave plate for the forward propagating linearly polarized wave, which converts the x-or y-polarized wave into a nearly perfect left-or right-handed circularly polarized wave; intriguingly, it also serves as a 45°polarization rotator for the backward propagating linearly polarized waves. This bifunctional metamaterial shows a high transmission as well as a broad bandwidth due to the Fabry-Perot-like interference effect. Using the similar approach, an abnormal broadband meta-quarter-wave plate is achieved to convert the forward x-and y-polarized or the backward y-and x-polarized waves into left-and right-handed circularly polarized waves with high transmission efficiencies. The integration of multiple functions in a single structure endows the cascaded chiral metamaterials with great interests for the high-efficiency polarization-controlled applications.npj Computational Materials (2019) 5:93; https://doi.

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“…Metamaterials are artificial structures that are periodically arranged by various media or metals, in which unique properties can be obtained . Unlike the classic materials, in metamaterial, the physical properties could be designed according to the applications . In that sense, “Metamaterial” is more like a “method” than “material”.…”

Section: Introductionmentioning

confidence: 99%

Flexible 2.5D Metamaterial with High Mechanical Bearing Capacity for Electromagnetic Interference Filters at Microwave Frequency

Zhang

Jiang

et al. 2019

Adv Eng Mater

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Herein, the conception of 2.5D metamaterial is proposed. The basic idea of the 2.5D metamaterial is to build “3D” metamaterial by stacking 2D metasurfaces layer‐by‐layer. In this design, the trapezoidal prism units (3D) is built up by stacking a series of rectangle units (2D) together. This means, in the conception of 2.5D metamaterial, any kind of 3D structure with complex geometrical shape can be easily built up by controlling the 2D shape in each layer, which provide a new way for the fabrication of 3D complex units. Furthermore, paper is chosen as the substrate of 2D layer, because the interconnected lignocellulosic microfibers in paper will not only bring in flexibility to the 2.5D metamaterial but also strong mechanical strength. The results show that the 2.5D metamaterial still maintain a good filtering performance at 11 GHz when the pressure loading rise up to 7 MPa, whereas the classic 3D metamaterial (built by copper‐clad plate) undergoes a fracture failure. The conception and demonstration of 2.5D metamaterial with high mechanical property not only overcome the lacking of the basic structural carrying capacity in 3D electromagnetic metamaterial but also give new idea to the design of multifunctional metamaterial.

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Experimental demonstration of ultra-large-scale terahertz all-dielectric metamaterials

Cited by 90 publications

References 45 publications

Toroidal Dipole Resonances in All‐Dielectric Oligomer Metasurfaces

Toroidal Dipole Resonances in All‐Dielectric Oligomer Metasurfaces

High-performance bifunctional polarization switch chiral metamaterials by inverse design method

Flexible 2.5D Metamaterial with High Mechanical Bearing Capacity for Electromagnetic Interference Filters at Microwave Frequency

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