Madaras S E, Creeden J, Kittiwatanakul S, Lu J, Novikova I, Lukaszew R A
Opt Express. 2018 Oct 1;26(20):25657-25666. doi: 10.1364/OE.26.025657.
We report on a new mechanism capable of inducing the insulator-metal transition (IMT) in VO via surface plasmon polaritons (SPP). Our theoretical model predicts that for a bilayer Au-VO sample an enhanced electromagnetic energy density at the Au-VO interface will occur at 1064nm laser wavelength when SPPs are excited in the Au layer. This effect can assist the IMT in the VO layer and at the same time, the SPP absorption can be used to detect it. Changes in the optical properties of the VO thin layer in such structure can be observed in the reflected light in Kretschmann configuration, via a shift in the nadir location due to light absorption at resonance. This optical mechanism occurs at 2mW threshold transition energies and fully saturates at 5mW.
我们报道了一种能够通过表面等离激元极化子（SPP）在VO中诱导绝缘体-金属转变（IMT）的新机制。我们的理论模型预测，对于双层Au-VO样品，当在Au层中激发SPP时，在1064nm激光波长下Au-VO界面处的电磁能量密度将增强。这种效应可以辅助VO层中的IMT，同时，SPP吸收可用于检测它。在Kretschmann配置下，通过共振时光吸收导致的最低点位置移动，可以在反射光中观察到这种结构中VO薄层光学性质的变化。这种光学机制在2mW的阈值转变能量下发生，并在5mW时完全饱和。
