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Infrared subwavelength focusing metasurfaces for harvesting heat from the Eartha??s back radiation
摘要： In this paper, we introduce two different metasurfaces that can achieve subwavelength focusing of the electromagnetic radiation in the infrared range with transmission ef?ciencies reaching 46% and 74.33% in silicon and thus they can be integrated in heat harvesting applications. We made our designs at the wavelength of 10 μm which is the peak of the back radiation of the Earth. In designing our metasurfaces in the infrared range, we used the phase modulation techniques that proved to be useful in the visible domain. The best focusing resolution achieved in our metasurfaces is 0.26λ (super-focusing). In addition to heat harvesting, the two proposed metasurfaces can be useful in other compact applications that require manipulating the mid-infrared radiation on a very small scale. We used copper and silicon in our metasurfaces which are speci?cally suitable for the mid-infrared range besides being CMOS compatible. In this paper, we also explained how heat can be harvested from the introduced metasurfaces using the Seebeck effect.
关键词： plasmonics,subwavelength focusing,planar lens,phase modulation,heat harvesting,metasurface,mid-infrared focusing
更新于2025-09-19 17:13:59
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Enhancing the Bandwidth in Transmitarray Antennas Using Tapered Transmission Line Matching Approach
摘要： This paper proposes an innovative method to improve the bandwidth of transmitarray antennas using a tapered transmission line approach. A novel three-layer perforated dielectric unit-cell is introduced: it is made up by a central layer, with a varying size square hole, and two linearly tapered matching layers. To validate the proposed solution, a wideband transmitarray composed by 60x60 elements and working in Ka-band has been designed and simulated. The simulated structure has a size of 15λ × 15λ and it provides a 1-dB gain bandwidth of 27.4%, an aperture ef?ciency of 45.3% and a gain of 31.1 dB at 30 GHz.
关键词： Wideband antenna,planar lens,transmitarray
更新于2025-09-04 15:30:14