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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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悬浮,偏振依赖的,低波长穿孔金属吸收器用于中红外波罗测.

Silvia Guadagnini1, Zarko Sakotic2, Yue Yu3

  • 1Department of Physics & Astronomy, University of Southern California, Los Angeles, California 90089, United States.

Nano letters
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概括

研究人员开发了具有可调节光谱响应的超薄金属吸收器,用于中波红外 (MIR) 探测器应用. 这些新型设备提供强大,选择性的吸收和极化控制,推进了MIR波力测.

关键词:
博洛米特里 (bolometry) 是一种测量方法.稀薄金属吸收器的使用方法中波红外吸收器中波红外吸收器两极分化依赖关系

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术

背景情况:

  • 控制中波红外 (MIR) 吸收的光谱和极化特征对于探测器应用至关重要.
  • 现有的方法往往面临着鱼性,体积或热量方面的局限性.

研究的目的:

  • 为MIR应用设计和制造具有可调节光谱响应的超薄金属吸收器.
  • 为了在最小的体积和减少的热量下实现强烈和选择性的吸收.
  • 为了研究偏振依赖于偏振的MIR球度的偏振响应.

主要方法:

  • 制造具有深度亚波长穿孔的超薄金属薄膜.
  • 穿孔薄膜在反射腔上进行集成.
  • 在悬浮薄膜装置中证明吸收.
  • 在失对称膜中对极度反应的分析建模.

主要成果:

  • 在没有内平面共振的情况下,在超薄金属吸收器中实现了可调节的光谱响应.
  • 在最小体积的悬浮装置中,证明了强大和选择性的MIR吸收 (70%在3μm附近).
  • 在对称性破裂的薄膜中观察到平面内异构反应,由不同的有效薄膜允许度解释.

结论:

  • 超薄的穿孔金属薄膜为可调MIR吸收提供了一个有前途的平台.
  • 开发的吸收器适用于低热质量玻利米度应用.
  • 控制偏振响应的能力为先进的偏振依赖MIR探测器开辟了道路.