Design Method of a Broadband Wide-Angle Plasmonic Absorber in the Visible Range

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• 作者：Xianshun Ming ; Qiaofeng Tan
• 关键词：Plasmonic absorber ; Surface plasmons ; Resonant cavity modes ; Broadband wide ; angle absorption
• 刊名：Plasmonics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：12
• 期：1
• 页码：117-124
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Biotechnology; Nanotechnology; Biophysics and Biological Physics; Biochemistry, general;
• 出版者：Springer US
• ISSN：1557-1963
• 卷排序：12

文摘

A new design method of a broadband wide-angle metal-dielectric-metal plasmonic absorber is presented based on the cavity mode theory. The broadband absorption is implemented by filling a unit cell with multi-size square metal patches resonant at adjacent wavelengths, with the widths of the patches and thickness of the dielectric layer optimized with the presented method. A broadband plasmonic absorber working in the visible range is designed, the absorption of which is insensitive to the azimuth angle of incident field and keeps over 0.7 at incident angle up to 60° for p polarization and above 0.6 at up to 40° for s polarization.