Rough metal and dielectric layers make an even better hyperbolic metamaterial absorber
Rough metal and dielectric layers make an even better hyperbolic metamaterial absorber
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DOI：
10.1364/oe.22.014975
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发表时间：
2014-06-16
期刊：
影响因子：
3.8
通讯作者：
Lavrinenko, Andrei V.
中科院分区：
文献类型：
--
作者：
Andryieuski, Andrei;Zhukovsky, Sergei V.;Lavrinenko, Andrei V.
我们数值研究了粗糙层厚度对双曲型超材料（HALF）性能的影响。我们发现，随机空间变化的电介质和金属层的厚度，类似于在实际的结构制造过程中发生的，导致戏剧性的吸收增加相比，一个理想的，平滑层HMM的吸收增加更强烈时，粗糙度引起的整个HMM，而不是在其表面层。因此，我们已经发现，适度的表面粗糙度不会使HMM功能变差，至少在吸收相关的应用中，从而消除了超光滑金属层制造的挑战。更严重的粗糙度也可以证明在廉价的HMM基宽带吸收器的设计中是有用的。(C)2014年美国光学学会
We numerically investigate the influence of roughness in layer thicknesses on the properties of hyperbolic metamaterials (HMMs). We show that random spatial variation of dielectric and metal layer thicknesses, similar to what occurs during actual structure fabrication, leads to dramatic absorption increase compared to an ideal, smooth-layer HMM; the absorption increases more strongly when roughness is induced throughout the HMM rather than in its surface layer only. Hence, we have found that moderate surface roughness does not deteriorate the HMM functionality, at least in absorption-related applications, thus eliminating the challenge of ultrasmooth metal layer fabrication. More severe roughness can also prove useful in the design of inexpensive HMM-based broadband absorbers. (C) 2014 Optical Society of America