Ultra-broadband infrared metasurface absorber
Ultra-broadband infrared metasurface absorber
复制标题
超宽带红外超表面吸收体
DOI：
10.1364/oe.24.020586
复制
发表时间：
2016-09-05
期刊：
影响因子：
3.8
通讯作者：
Han, Tiancheng
中科院分区：
文献类型：
--
作者：
Guo, Wenliang;Liu, Yuexia;Han, Tiancheng
利用亚波长谐振腔的超材料吸收体，由于其良好的吸收特性，在许多科学技术应用中显示出巨大的潜力。在大多数实际应用中，吸收带宽是最重要的性能指标之一。在本文中，我们展示了一种基于超表面的超宽带红外吸收器的设计。与先前的工作[Opt. Express 22(S7), A1713-A1724(2014)]相比，所提出的吸收器显示出两倍以上的吸收带宽。在7.8 ~ 12.1 μ m范围内，模拟的总吸收超过90%，半最大值时的全宽度为50% (7.5 ~ 12.5 μ m)，采用单层超表面实现。进一步研究表明，采用两层超表面，即双层吸收体，可以大大扩大吸收带宽。在5.2 ~ 13.7 μ m范围内，双层吸收体的总吸收率超过80%，半最大值时的全宽度为95%（从5.1 ~ 14.1 μ m），远高于之前报道的红外光谱。随着入射角的增加，吸收随波动而减小，但在相对较大的入射角内保持准恒定。(C) 2016年美国光学学会
By using sub-wavelength resonators, metamaterial absorber shows great potential in many scientific and technical applications due to its perfect absorption characteristics. For most practical applications, the absorption bandwidth is one of the most important performance metrics. In this paper, we demonstrate the design of an ultra-broadband infrared absorber based on metasurface. Compared with the prior work [Opt. Express 22(S7), A1713-A1724 (2014)], the proposed absorber shows more than twice the absorption bandwidth. The simulated total absorption exceeds 90% from 7.8 to 12.1 um and the full width at half maximum is 50% (from 7.5 to 12.5 mu m), which is achieved by using a single layer of metasurface. Further study demonstrates that the absorption bandwidth can be greatly expanded by using two layers of metasurface, i.e. dual-layered absorber. The total absorption of the dual-layered absorber exceeds 80% from 5.2 to 13.7 um and the full width at half maximum is 95% (from 5.1 to 14.1 mu m), much greater than those previously reported for infrared spectrum. The absorption decreases with fluctuations as the incident angle increases but remains quasi-constant up to relatively large angles. (C) 2016 Optical Society of America