High-temperature broadband reflection reduction: design, fabrication, and characterization

We report the design, fabrication, and measurement of a refractory metamaterial with a broadband reflection reduction insensitive to temperature. This is achieved based on a polarization conversion, which demonstrates a significant bandwidth expansion due to the three electromagnetic resonances gene...

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Veröffentlicht in:Optics express 2021-12, Vol.29 (26), p.42621
Hauptverfasser: Han, Tiancheng, Wen, Kaihuai, Lu, Haipeng, Wang, Xin, Zhang, Li, Liang, Difei, Deng, Longjiang
Format: Artikel
Sprache:eng
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Zusammenfassung:We report the design, fabrication, and measurement of a refractory metamaterial with a broadband reflection reduction insensitive to temperature. This is achieved based on a polarization conversion, which demonstrates a significant bandwidth expansion due to the three electromagnetic resonances generated in a simple cut-wire unit. The unit cell can effectively convert linearly polarized waves into cross-polarized waves in the frequency band of 4.3 GHz to 7.3 GHz, with the polarization conversion ratio (PCR) above 90%. After arranging the polarization conversion units in chessboard layout with 0/1 form, a low specular reflection below -10dB from 4.3 GHz to 7.3 GHz is obtained. The broadband reflection reduction has been experimentally validated in a wide temperature range from room temperature to 500°C. It is believed that these results may provide a new route to achieve broadband reflection reduction at a wide temperature range and are promising for many applications.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.443374