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The metasurface is etched on the top side of the substrate, while the feeding structure, which is a wideband, leaky-wave, center-fed open-ended slotline, is printed on the bottom side of the substrate. Rather than an instantaneous disturbance triggering a complicated cascade of disturbances, the disturbances concentrate on a particular pattern: Concerning computational cost reduction, we recall the choice of the irreducible Brillouin zone in terms of the unit cell symmetries, and we show that band-gap characteristics can be obtained from the irreducible Brillouin zone contour, only when bisectors or diagonals of the unit cell are mirror axes. The sediment—water interface in aquaculture ponds is both a sink and a source of various substances that are potentially toxic for cultured species. We demonstrate how controlled emission of hot electrons in plasmonic nanoantennas leads to highly localized nanochemistry. In the last years, cloaking has revealed its potentialities in many realistic applications, ranging from the design of extremely compact TLC platforms up to the compensation of the Doppler effect affecting moving objects. Recent progress in photonic materials, such as metamaterials, enable unprecedented control over light propagation and open a new paradigm for spin and orbital momenta related phenomena in optical physics.
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