Performance enhancement due to a top dielectric coating on a metamaterial perfect absorber

Pradhan Jitendra K.; Achanta Venu Gopal; Agarwal Amit K.; Ramakrishna S. Anantha

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Performance enhancement due to a top dielectric coating on a metamaterial perfect absorber

机译：由于超大型完美吸收器上的顶部介电涂层引起的性能增强

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A tri-layer metamaterial structure with enhanced absorption is demonstrated at infrared wavelengths by coating the top surface of the metamaterial absorber with an additional thin layer of dielectric material. The metamaterial absorber, which consists of a micrometer-sized metallic circular patch separated from a metal ground plane by a dielectric spacer layer, when coated with a supplementary protective dielectric layer on the top, shows a spectral red shift of the peak absorption along with a change in the absorption amplitude. The increase or decrease in absorption arises basically from an interference phenomenon of light reflected from the surface of the protective dielectric and the surface of metamaterial structures, and is highly dependent on the thickness of the top dielectric layer. The protective dielectric coatings provide an alternative way to modify and optimize the absorption in a metamaterial absorber along with a robustness that protects metamaterial structures from environmental and mechanical degradation. (C) 2020 Optical Society of America

机译：通过用额外的薄膜介电材料涂覆超材料吸收器的顶表面，在红外波长下对具有增强的吸收的三层超材料结构。金属材料吸收器，由介电间隔层由介电间隔层与金属接地平面分开的微米尺寸的金属圆形贴片，当涂覆有辅助保护介电层的介质隔板上，显示了峰值吸收的光谱红色偏移变化吸收幅度。吸收的增加或减少基本来自从保护电介质和超材料结构表面反射的光的干涉现象，并且高度依赖于顶部介电层的厚度。保护性介电涂层提供了一种替代方法，可以改变和优化超材料吸收器中的吸收以及保护来自环境和机械降解的超材料结构的鲁棒性。（c）2020美国光学学会

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来源
《Applied optics》 |2020年第17期|共8页
作者
Pradhan Jitendra K.; Achanta Venu Gopal; Agarwal Amit K.; Ramakrishna S. Anantha;
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Indian Inst Technol Dept Phys Kanpur 208016 Uttar Pradesh India;

Tata Inst Fundamental Res Homi Bhabha Rd Mumbai 400005 Maharashtra India;

DRDO Instruments Res &

Dev Estab Raipur Rd Dehra Dun 248008 Uttarakhand India;

Indian Inst Technol Dept Phys Kanpur 208016 Uttar Pradesh India;

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Performance enhancement due to a top dielectric coating on a metamaterial perfect absorber

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