Knight S, Schöche S, Darakchieva V, Kühne P, Carlin J-F, Grandjean N, Herzinger C M, Schubert M, Hofmann T
Opt Lett. 2015 Jun 15;40(12):2688-91. doi: 10.1364/OL.40.002688.
The effect of a tunable, externally coupled Fabry-Perot cavity to resonantly enhance the optical Hall effect signatures at terahertz frequencies produced by a traditional Drude-like two-dimensional electron gas is shown and discussed in this Letter. As a result, the detection of optical Hall effect signatures at conveniently obtainable magnetic fields, for example, by neodymium permanent magnets, is demonstrated. An AlInN/GaN-based high-electron mobility transistor structure grown on a sapphire substrate is used for the experiment. The optical Hall effect signatures and their dispersions, which are governed by the frequency and the reflectance minima and maxima of the externally coupled Fabry-Perot cavity, are presented and discussed. Tuning the externally coupled Fabry-Perot cavity strongly modifies the optical Hall effect signatures, which provides a new degree of freedom for optical Hall effect experiments in addition to frequency, angle of incidence, and magnetic field direction and strength.
本文展示并讨论了一个可调谐的、外部耦合的法布里-珀罗腔对由传统类德鲁德二维电子气在太赫兹频率下产生的光学霍尔效应特征进行共振增强的效果。结果表明，例如通过钕永磁体，能够在方便获得的磁场下检测光学霍尔效应特征。实验采用了生长在蓝宝石衬底上的基于AlInN/GaN的高电子迁移率晶体管结构。文中给出并讨论了由外部耦合法布里-珀罗腔的频率、反射率最小值和最大值所决定的光学霍尔效应特征及其色散。对外部耦合法布里-珀罗腔进行调谐会强烈改变光学霍尔效应特征，这为光学霍尔效应实验提供了除频率、入射角以及磁场方向和强度之外的新自由度。
