Simulation, fabrication and characterization of THz metamaterial absorbers.
Simulation, fabrication and characterization of THz metamaterial absorbers.
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DOI：
10.3791/50114
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发表时间：
2012-12
期刊：
影响因子：
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通讯作者：
J. Grant;I. McCrindle;D. Cumming
中科院分区：
文献类型：
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作者：
J. Grant;I. McCrindle;D. Cumming
超材料（MM），人工材料设计具有可能在自然界中找不到的特性，自从第一次理论（1）和实验证明（2）它们独特的特性以来，已经被广泛探索。微波可以提供高度可控的电磁响应，并且迄今为止已经在每个技术相关的光谱范围中得到证明，包括光学（3）、近红外（4）、中红外（5）、太赫兹（6）、毫米波（7）、微波（8）和无线电（9）频带。应用包括完美镜头（10）、传感器（11）、电信（12）、隐形斗篷（13）和滤光片（14，15）。我们最近开发了单波段（16），双波段（17）和宽带（18）THz超材料吸收器设备，能够在共振峰处吸收大于80%。MM吸收体的概念在THz频率下尤其重要，在THz频率下难以找到强频率选择性THz吸收体（19）。在我们的MM吸收体中，THz辐射在~ λ/20的厚度内被吸收，克服了传统的四分之一波长吸收体的厚度限制。MM吸收体自然地适用于THz检测应用，例如热传感器，并且如果与合适的THz源（例如QCL）集成，则可以导致紧凑、高灵敏度、低成本、真实的THz成像系统。
Metamaterials (MM), artificial materials engineered to have properties that may not be found in nature, have been widely explored since the first theoretical(1) and experimental demonstration(2) of their unique properties. MMs can provide a highly controllable electromagnetic response, and to date have been demonstrated in every technologically relevant spectral range including the optical(3), near IR(4), mid IR(5) , THz(6) , mm-wave(7) , microwave(8) and radio(9) bands. Applications include perfect lenses(10), sensors(11), telecommunications(12), invisibility cloaks(13) and filters(14,15). We have recently developed single band(16), dual band(17) and broadband(18) THz metamaterial absorber devices capable of greater than 80% absorption at the resonance peak. The concept of a MM absorber is especially important at THz frequencies where it is difficult to find strong frequency selective THz absorbers(19). In our MM absorber the THz radiation is absorbed in a thickness of ~ λ/20, overcoming the thickness limitation of traditional quarter wavelength absorbers. MM absorbers naturally lend themselves to THz detection applications, such as thermal sensors, and if integrated with suitable THz sources (e.g. QCLs), could lead to compact, highly sensitive, low cost, real time THz imaging systems.