Li Jian-Bo, Tan Xiao-Long, Ma Jin-Hong, Xu Si-Qin, Kuang Zhi-Wei, Liang Shan, Xiao Si, He Meng-Dong, Kim Nam-Chol, Luo Jian-Hua, Chen Li-Qun
Institute of Mathematics and Physics, Central South University of Forestry and Technology, Changsha 410004, People's Republic of China.
Nanotechnology. 2018 Jun 22;29(25):255704. doi: 10.1088/1361-6528/aabbdc. Epub 2018 Apr 5.
We present a study for the impact of exciton-phonon and exciton-plasmon interactions on bistable four-wave mixing (FWM) signals in a metal nanoparticle (MNP)-monolayer MoS nanoresonator hybrid system. Via tracing the FWM response we predict that, depending on the excitation conditions and the system parameters, such a system exhibits 'U-shaped' bistable FWM signals. We also map out bistability phase diagrams within the system's parameter space. Especially, we show that compared with the exciton-phonon interaction, a strong exciton-plasmon interaction plays a dominant role in the generation of optical bistability, and the bistable region will be greatly broadened by shortening the distance between the MNP and the monolayer MoS nanoresonator. In the weak exciton-plasmon coupling regime, the impact of exciton-phonon interaction on optical bistability will become obvious. The scheme proposed may be used for building optical switches and logic-gate devices for optical computing and quantum information processing.
我们展示了一项关于激子 - 声子和激子 - 等离子体相互作用对金属纳米颗粒（MNP） - 单层MoS纳米谐振器混合系统中双稳态四波混频（FWM）信号影响的研究。通过追踪FWM响应，我们预测，根据激发条件和系统参数，这样的系统会呈现出“U形”双稳态FWM信号。我们还绘制了系统参数空间内的双稳性相图。特别地，我们表明，与激子 - 声子相互作用相比，强激子 - 等离子体相互作用在光学双稳性的产生中起主导作用，并且通过缩短MNP与单层MoS纳米谐振器之间的距离，双稳区域将大大拓宽。在弱激子 - 等离子体耦合 regime中，激子 - 声子相互作用对光学双稳性的影响将变得明显。所提出的方案可用于构建用于光学计算和量子信息处理的光开关和逻辑门器件。
