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首页> 外文期刊>RSC Advances >Ultra-narrow terahertz perfect light absorber based on surface lattice resonance of a sandwich resonator for sensing applications
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Ultra-narrow terahertz perfect light absorber based on surface lattice resonance of a sandwich resonator for sensing applications

机译：基于三明治共振器表面晶格共振的超窄太赫兹完美光吸收器，用于传感应用

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摘要

Perfect light absorbers have attracted much attention because of their potential applications in solar cells, thermal imaging, material detection, bio-sensing, and others. However, it is extremely difficult to obtain the ultra-narrow bandwidth of a perfect light absorber in the terahertz region. Herein, an ultra-narrow terahertz perfect light absorber based on the surface lattice resonance of three stacking layers, namely a square resonator, a dielectric spacer, and a metallic film, is reported. A resonance absorption peak with bandwidth of 0.0200 THz and absorption rate of 98.86% is realized. The absorption performance of the device can be controlled by employing different sized (unit) periods and dielectric spacer thicknesses. Particularly, the device bandwidth can be decreased by reducing the dielectric layer thickness. At a certain thickness, a resonance peak with a bandwidth of only 0.0067 THz is achieved. This peak is very sensitive to the surrounding refractive index. The large sensitivity (2.58 THz per refractive index) and simultaneous ultra-narrow bandwidth lead to an ultra-high figure of merit (385.07), making this a promising light device in terahertz detection and sensing.
机译：完美的光吸收剂因其在太阳能电池，热成像，材料检测，生物传感等领域的潜在应用而备受关注。然而，在太赫兹区域中获得理想的光吸收器的超窄带宽是极其困难的。在本文中，报道了基于三个堆叠层的表面晶格共振的超窄太赫兹完美光吸收剂，即三个堆叠层，即方形共振器，介电间隔物和金属膜。实现了带宽为0.0200 THz，吸收率为98.86％的共振吸收峰。器件的吸收性能可以通过采用不同大小（单位）的周期和介电垫片厚度来控制。特别地，可以通过减小介电层的厚度来减小器件带宽。在一定的厚度下，可以获得仅0.0067 THz带宽的共振峰。该峰对周围的折射率非常敏感。高灵敏度（每个折射率2.58 THz）和同时的超窄带宽导致了超高品质因数（385.07），这使其成为太赫兹检测和传感领域的有前途的照明设备。

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