利用介電係數趨近零材料設計層狀寬帶超穎吸收膜;Using epsilon-near-zero material to design lamellar broadband metamaterial absorber

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题名:	利用介電係數趨近零材料設計層狀寬帶超穎吸收膜;Using epsilon-near-zero material to design lamellar broadband metamaterial absorber
作者:	廖偉博;Liao, Wei-Bo
贡献者:	光電科學與工程學系
关键词:	吸收膜;介電係數趨近零;表面電漿;absorption film;epsilon-near-zero;surface plasma
日期:	2020-10-15
上传时间:	2021-03-18 17:00:39 (UTC+8)
出版者:	國立中央大學
摘要:	傳統的超穎材料使用蝕刻技術製作複雜週期結構，本研究提出無蝕刻之層狀寬帶超穎吸收膜，利用epsilon-near-zero(ENZ)產生強吸收，並使用導納法調整ENZ 材料與介電質材料之厚度，與入射介質之阻抗匹配，達到近乎完美吸收，模擬設計在500 奈米至1300 奈米平均吸收率高達99.6%，實際樣品平均吸收率仍有98.5%。此外，本研究之超穎吸收膜對入射角不敏感，模擬在60 度入射角平均吸收率仍有接近94%。未鍍膜的布經過模擬的太陽光照射15 分鐘，溫度上升至33 度，鍍在布上的寬帶超穎吸收膜，溫度高達44 度，有效率地將電磁波轉換為熱，若將寬帶超穎吸收膜應用在衣物上，可以幫助人們在寒冷的天氣，藉由吸收太陽光而保持溫暖。;Typical metamaterials are composed of periodically arranged pattern, a dielectric spacer layer and a thick metal layer. To realize the periodically arranged pattern, lithography or etching process is required. In this study, a broadband metamaterial absorber which based on epsilon-near-zero (ENZ) mode to achieve near perfect absorber was deposited using magnetron sputtering system without any complex fabrication process. The thickness of ENZ layers and dielectric layers optimized according to admittance-matching method. The simulation and fabricated average absorption from 500 nm to 1300 nm were 99.6% and 98.5%, respectively. Besides, the absorber is angular insensitive up to 60°. The temperature of the absorber which deposited on cloth increase from room temperature to 44℃, 11℃ higher than the uncoated cloth which is 33℃, after exposed to simulated sunlight for 15 minutes. Thus the absorber without any structural pattern discussed in this paper might have many applications, the simplest one is to help people keep warm in the cold weather.
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