School of Engineering, University of Glasgow, Glasgow, United Kingdom.
Opt Lett. 2011 Sep 1;36(17):3476-8. doi: 10.1364/OL.36.003476.
We present the simulation, implementation, and measurement of a polarization insensitive broadband resonant terahertz metamaterial absorber. By stacking metal-insulator layers with differing structural dimensions, three closely positioned resonant peaks are merged into one broadband absorption spectrum. Greater than 60% absorption is obtained across a frequency range of 1.86 THz where the central resonance frequency is 5 THz. The FWHM of the device is 48%, which is two and half times greater than the FWHM of a single layer structure. Such metamaterials are promising candidates as absorbing elements for bolometric terahertz imaging.
我们提出了一种偏振不敏感宽带共振太赫兹超材料吸收体的仿真、实现和测量。通过堆叠具有不同结构尺寸的金属-绝缘体层，三个位置接近的共振峰融合成一个宽带吸收光谱。在中心共振频率为 5 THz 的 1.86 THz 频率范围内，吸收率大于 60%。该器件的半峰全宽为 48%，是单层结构的半峰全宽的两倍半。这种超材料有望成为用于量热太赫兹成象的吸收元件。
