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Timestamp: 2019-04-22 18:57:28+00:00

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Mie-resonance terahertz absorbers by self-assembly method are designed and demonstrated in experiments and simulations. A monolayer of zirconium dioxide (ZrO2) microspheres fixed on a copper film with designed grids that were manufactured by direct writing with a composite ink system composed of polydimethylsiloxane (PDMS). More importantly, different spacing and array configurations were created economically and efficiently, showing visual performance. Magnetic resonance leads to near-unity absorption at about 0.4 THz in the samples. This work demonstrates efficient terahertz absorbers and highlights a novel direct writing fabrication method that can be extended to produce other optical devices for applications.
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Fig. 1 The photograph of the direct writing process of Adventure 3D-LB-Printer.
Fig. 2 (a) The diagrammatic sketch of the reflection module in THz-TDS system. (b) Beam path diagram of THz wave.
Fig. 3 (a) Scanning electron microscope (SEM) image of the industrially produced ZrO2 microspheres. (b) XRD spectra of the particles. The red curve is the measured spectrum and the black vertical line is the spectrum from the tetragonal ZrO2 PDF standard card. (c) Schematic illustration of the process of direct writing of the 2D grid.
Fig. 4 (a) Hexagonal 2D grid of the metamaterial absorber, where the incident plane wave is polarized as indicated. (b-d) MPAs with microspheres spaced at 250 μm, 280 μm and 300 μm, respectively.
Fig. 5 (a) Simulated and (b) experimental absorption. (c) Spatial distribution of the resonant magnetic field H from simulations. (d) Simulated results of the uniform and nonuniform dimensions of the microspheres.
Fig. 6 Simulations of transmission. (a) The S-parameter. (b) Schematic diagram of the unit cell of a dielectric sphere. (c) and (d) Simulated distribution of the electric field and magnetic field.
Fig. 7 (a) Square 2D grid of metamaterial absorber, where the incident plane wave is polarized in the same manner as Fig. 2a above. (b) Simulated and (c) experimental absorption. (d) Simulations of absorption behaviors at different microsphere’s radius. (e) Schematic diagram of incident angle θinc. (f) Simulations of absorption behaviors at different incident angle (θinc) of THz wave.
Fig. 8 The absorption of the sample without microspheres.
Fig. 9 The schematic diagram of sphere influenced by surrounding spheres in different lattice.
(4) A(ω)=1−R(ω)=1− | S 11 (ω) | 2 .

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