Metamaterial perfect absorbers with solid and inverse periodic cross structures for optoelectronic applications.
Metamaterial perfect absorbers with solid and inverse periodic cross structures for optoelectronic applications.
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DOI：
10.1364/oe.25.008288
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发表时间：
2017-04
期刊：
影响因子：
3.8
通讯作者：
Haochi Yu;Ziyi Zhao;Q. Qian;Jie Xu;Peng Gou;Yuexin Zou;Jun Cao;Le Yang;J. Qian;Z. An
中科院分区：
文献类型：
--
作者：
Haochi Yu;Ziyi Zhao;Q. Qian;Jie Xu;Peng Gou;Yuexin Zou;Jun Cao;Le Yang;J. Qian;Z. An
基于金属/绝缘体/金属（MIM）三层结构的超材料为包括半导体光电探测器在内的各种应用提供了实现高吸收效率的灵活平台。在这项工作中，我们使用有限时域差分（FDTD）方法和耦合模式理论（CMT）对金属/半导体/金属（MSM）结构进行了数值研究，并讨论了它们在光电应用中的有效吸收。我们比较了不同顶部金属层设计的MSM结构，发现十字形吸收器（CSA）和它的互补十字形吸收器（CCSA）由于辐射损耗对几何参数的独特依赖而表现出不同的相图。我们的研究结果表明，CSA （CCSA）结构适用于更薄（更厚）的夹层半导体，其介电常数的虚部较大（更小）。通过与理想吸收条件的比较，讨论了达到有效吸收的最大优值的必要条件。我们的工作为设计基于超材料-半导体混合系统的通用高效光收集光电子器件提供了指导。
Metamaterial based on a metal/insulator/metal (MIM) tri-layer structure provides an agile platform to realize high absorption efficiency for a variety of applications including semiconductor optoelectronic detectors. In this work, we use the finite time domain difference (FDTD) method and coupled mode theory (CMT) to numerically study metal/semiconductor/metal (MSM) structures and discuss their effective absorption for optoelectronic application. We compare MSM structures with a different top metal layer design and find that cross shaped absorber (CSA) and it's complementary cross shaped absorber (CCSA) exhibit different phase diagrams due to a distinctive dependence of radiation loss on geometrical parameters. Our results show that CSA (CCSA) structures are suitable for thinner (thicker) sandwiched semiconductor with a larger (smaller) imaginary part of its dielectric constant. The necessary condition to realize a maximum figure of merit (FOM) value for effective absorption is discussed in comparison with the perfect absorber condition. Our work may provide guidelines to design the general light-harvesting optoelectronic devices with high efficiencies based on metamaterial-semiconductor hybrid systems.