Energy loss of terahertz electromagnetic waves by nano-sized connections in near-self-complementary metallic checkerboard patterns
Energy loss of terahertz electromagnetic waves by nano-sized connections in near-self-complementary metallic checkerboard patterns
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DOI：
10.1063/1.4997882
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发表时间：
2017-08-14
影响因子：
3.2
通讯作者：
Akalin, Tahsin
中科院分区：
文献类型：
--
作者：
Takano, Keisuke;Tanaka, Yoku;Akalin, Tahsin
自互补金属棋盘图案的设计实现了宽带、无色散和最大化的吸收，集中在正方形之间的深亚波长电阻连接中，对能量吸收区域没有任何理论限制。在这里，我们的实验和数值研究的电磁响应的极限非常小的连接。我们表明，有限的导电性和随机性在近自互补棋盘图案中产生的频率无关的能量损失在太赫兹频率区域中发挥了至关重要的作用。在这里，金属表现得像一个几乎完美的导体。当棋盘图案接近完美的自互补图案时，由于纳米级连接处的有限电导率，完美导体近似自发地破裂，导致宽带吸收。它还表明，金属正方形之间的随机连接也导致宽带和最大化的能量损失，通过散射损耗，类似于有限的电导率。由AIP出版社出版。
The design of a self-complementary metallic checkerboard pattern achieves broadband, dispersionless, and maximized absorption, concentrating in deep subwavelength resistive connections between squares, without any theoretical limitation on the energy absorbing area. Here, we experimentally and numerically investigate the electromagnetic response in the limit of extremely small connections. We show that finite conductivity and randomness in a near-self-complementary checkerboard pattern play a crucial role in producing a frequency-independent energy loss in the terahertz frequency region. Here, metals behave like an almost perfect conductor. When the checkerboard pattern approaches the perfect self-complementary pattern, the perfect conductor approximation spontaneously breaks down, owing to the finite conductivity at the nano-scale connection, leading to broadband absorption. It is also shown that the random connections between metallic squares also lead to broadband and maximized energy loss through scattering loss, similar to finite conductivity. Published by AIP Publishing.