Xiao Binggang, Gu Mingyue, Xiao Sanshui
Appl Opt. 2017 Jul 1;56(19):5458-5462. doi: 10.1364/AO.56.005458.
Tunable terahertz absorbers composed of periodically cross-shaped graphene arrays with the ability to achieve near-unity absorbance are proposed and studied. Our results demonstrate that the bandwidth of absorption rate above 90% can reach up to 1.13 terahertz by use of a single layer of cross-shaped graphene arrays. By simply stacking the double layer cross-shaped graphene with careful design, the working bandwidth can be broadened compared with the single-layer graphene-based absorber. The proposed absorbers have the properties of being polarization insensitive and having large angle tolerance, and the tunability of the Fermi level in graphene allows us to realize tunable terahertz absorbers with potential interest in integrated terahertz optoelectronic devices.
提出并研究了由周期性十字形石墨烯阵列组成的可调谐太赫兹吸收体，该吸收体能够实现近乎单位的吸光度。我们的结果表明，通过使用单层十字形石墨烯阵列，吸收率高于90%的带宽可达1.13太赫兹。通过精心设计简单堆叠双层十字形石墨烯，与基于单层石墨烯的吸收体相比，工作带宽可以拓宽。所提出的吸收体具有偏振不敏感和大角度容忍的特性，并且石墨烯中费米能级的可调性使我们能够实现对集成太赫兹光电器件具有潜在兴趣的可调谐太赫兹吸收体。
