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Wei Z.,Tongji University | Wei Z.,Shanghai Key Laboratory of Special Artifical Microstructure Materials and Technology | Li H.,Tongji University | Li H.,Shanghai Key Laboratory of Special Artifical Microstructure Materials and Technology | And 11 more authors.
New Journal of Physics | Year: 2010

A thin metamaterial slab comprising a dielectric spacer sandwiched between a metallic grating and a ground plane is shown to possess spatially coherent surface resonance states that span a large frequency range and can be tuned by structural and material parameters. They give rise to nearly perfect angle-selective absorption and thus exhibit directional thermal emissivity. Direct numerical simulations show that the metamaterial slab supports spatially coherent thermal emission in a wide frequency range that is robust against structural disorder. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. Source


Wei Z.,Tongji University | Wei Z.,Shanghai Key Laboratory of Special Artifical Microstructure Materials and Technology | Fu J.,Tongji University | Fu J.,Shanghai Key Laboratory of Special Artifical Microstructure Materials and Technology | And 6 more authors.
Photonics and Nanostructures - Fundamentals and Applications | Year: 2010

We investigate the enhanced transmission through the square array of metallic coaxial annular apertures (MCAAs) in microwave frequency by varying the inner diameter of the apertures. The impact of local resonance is thoroughly embodied in the even-mode surface resonances, while the odd-mode surface resonances, invisible in measurements, are only scaled by periodicity. For MCAAs with smaller inner diameters, the transmission extrema are measured at specific incident angles matching the folded degenerate resonant states. The results are well understood in terms of the dispersion of surface resonances. © 2009 Elsevier B.V. All rights reserved. Source

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