Dietze D, Benz A, Strasser G, Unterrainer K, Darmo J
Institute of Photonics, Vienna University of Technology, Vienna, Austria.
Opt Express. 2011 Jul 4;19(14):13700-6. doi: 10.1364/OE.19.013700.
We present a method of coupling free-space terahertz radiation to intersubband transitions in semiconductor quantum wells using an array of meta-atoms. Owing to the resonant nature of the interaction between metamaterial and incident light and the field enhancement in the vicinity of the metal structure, the coupling efficiency of this method is very high and the energy conversion ratio from in-plane to z field reaches values on the order of 50%. To identify the role of different aspects of this coupling, we have used a custom-made finite-difference time-domain code. The simulation results are supplemented by transmission measurements on modulation-doped GaAs/AlGaAs parabolic quantum wells which demonstrate efficient strong light-matter coupling between meta-atoms and intersubband transitions for normal incident electromagnetic waves.
我们提出了一种利用超原子阵列将自由空间太赫兹辐射耦合到半导体量子阱中的子带间跃迁的方法。由于超材料与入射光之间相互作用的共振特性以及金属结构附近的场增强，该方法的耦合效率非常高，面内到z场的能量转换率达到50%左右的值。为了确定这种耦合不同方面的作用，我们使用了定制的时域有限差分代码。模拟结果通过对调制掺杂的GaAs/AlGaAs抛物量子阱的透射测量得到补充，这些测量表明对于垂直入射的电磁波，超原子与子带间跃迁之间存在有效的强光-物质耦合。
