Abstract
Ways to achieve highly efficient electromagnetic absorption over a broad bandwidth and broad angular spectrum have been discussed extensively in the past decades for various applications, such as low reflection devices and energy harvesting. To satisfy the efficiency requirements, metamaterial approaches have been explored in recent years. In this context, most studies have suggested the use of frequency selective surfaces or arrays of plasmonic resonators, which limit bandwidth and angular spectrum of performance. Here, we explore the application of refractory Brewster metasurfaces for photovoltaic applications. By matching the surface impedance of metasurfaces and free space at the Brewster angle, we show that metasurfaces can lead to efficient light absorption, and their response can be controlled accurately both in the angular and in the frequency spectrum to match the requirements of energy harvesting systems and facilitate large efficiency, high-temperature energy harvesting.
Highlights
Metamaterials have provided a viable solution to a variety of practical challenges in modern technology.[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16] In parallel, anomalous reflection and transmission in metasurfaces have inspired several exciting opportunities in various fields of research, from radiofrequencies to optics.[17,18,19,20,21,22,23,24] As an important application of metamaterials and metasurfaces, electromagnetic energy absorption with high efficiency has been actively studied in many forms and shapes
Studies of metamaterial absorbers have focused on resonance-based absorption,[25,26,27,28,29,30,31] which leads to small footprints but at the cost of performance degradation
The response of the non-tapered structure is quite interesting for energy harvesting applications in which the absorption spectrum of interest is confined at shorter wavelengths
Summary
Metamaterials have provided a viable solution to a variety of practical challenges in modern technology.[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16] In parallel, anomalous reflection and transmission in metasurfaces have inspired several exciting opportunities in various fields of research, from radiofrequencies to optics.[17,18,19,20,21,22,23,24] As an important application of metamaterials and metasurfaces, electromagnetic energy absorption with high efficiency has been actively studied in many forms and shapes. By steering waves into extended paths inside an absorptive layer, the metasurface can trap the impinging energy efficiently into a thin layer of photovoltaic material.[36] This approach has limitations in terms of angular spectrum response, since the application design typically assumes normal incidence. We explore absorbing metasurfaces based on the Brewster effect, which offer high efficiency of absorption both over a broad bandwidth and in the angular spectrum.
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