Department of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, Massachusetts 02467, USA.
Phys Rev Lett. 2013 Apr 26;110(17):177403. doi: 10.1103/PhysRevLett.110.177403. Epub 2013 Apr 25.
We present an experimental demonstration of electronically tunable metamaterial absorbers in the terahertz regime. By incorporation of active liquid crystal into strategic locations within the metamaterial unit cell, we are able to modify the absorption by 30% at 2.62 THz, as well as tune the resonant absorption over 4% in bandwidth. Numerical full-wave simulations match well to experiments and clarify the underlying mechanism, i.e., a simultaneous tuning of both the electric and magnetic response that allows for the preservation of the resonant absorption. These results show that fundamental light interactions of surfaces can be dynamically controlled by all-electronic means and provide a path forward for realization of novel applications.
我们在太赫兹波段展示了一种电子可调超材料吸收体的实验演示。通过将有源液晶掺入超材料单元的战略位置，我们能够将 2.62THz 处的吸收度调节 30%，并将共振吸收带宽调节 4%。数值全波模拟与实验吻合良好，并阐明了基本机制，即同时调节电响应和磁响应，从而保持共振吸收。这些结果表明，可以通过全电子手段动态控制表面的基本光相互作用，并为实现新型应用提供了途径。
