School of Mathematics and Physics, Changzhou University, Changzhou 213164, People's Republic of China.
Nanotechnology. 2017 Jun 23;28(25):255203. doi: 10.1088/1361-6528/aa7043. Epub 2017 Apr 28.
We utilize the surface plasmon field of a metal nanoparticle (MNP) to show strain-mediated coupling in a quantum dot-mechanical resonator hybrid system including a quantum dot (QD) embedded within a conical nanowire (NW) and a MNP in the presence of an external field. Based on the numerical solutions of the master equation, we find that a slow oscillation, originating from the strain-mediated coupling between the QD and the NW, appears in the time evolution of the plasmon field enhancement. The results show that the period (about [Formula: see text]) of the slow oscillation is equal to that of the mechanical resonator of NW, which suggests that the time-resolved measurement of the plasmon field enhancement can be easily achieved based on the current experimental conditions. Its amplitude increases with the increasing strain-mediated coupling strength, and under certain conditions there is a linear relationship between them. The slow oscillation of the plasmon field enhancement provides valuable tools for measurements of the mechanical frequency and the strain-mediated coupling strength.
我们利用金属纳米粒子（MNP）的表面等离激元场来展示包括嵌入在锥形纳米线（NW）中的量子点（QD）和 MNP 在内的量子点-机械共振子混合系统中的应变介导耦合，以及在外部场的存在下。基于主方程的数值解，我们发现，在等离子体场增强的时间演化中，起源于 QD 和 NW 之间的应变介导耦合的缓慢振荡出现。结果表明，慢振荡的周期（约[公式：见文本]）等于 NW 的机械共振子的周期，这表明可以根据当前的实验条件轻松实现等离子体场增强的时间分辨测量。其幅度随应变介导耦合强度的增加而增加，并且在某些条件下它们之间存在线性关系。等离子体场增强的缓慢振荡为机械频率和应变介导耦合强度的测量提供了有价值的工具。
