Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, USA.
J Chem Phys. 2012 Feb 7;136(5):054504. doi: 10.1063/1.3682089.
We use a finite-difference time-domain (FDTD) approach to describe and control light-induced charge dynamics via two constructs consisting of nanoscale silver cylinders. The charge dynamics is found to be significantly different from the energy dynamics intensively studied in the past in similar systems. It is shown that two-color sources with a tunable relative phase introduce the opportunity to control the charge dynamics via a simple and interesting control mechanism, namely, the time evolution of the charge is directly tied to the instantaneous value of the source fields. Hence, our ability to shape laser pulses and tailor their relative phases and amplitudes translates directly into the possibility of manipulating charge oscillations within metal nanoparticle arrays.
我们使用有限时域差分（FDTD）方法来描述和控制通过两个纳米尺度银柱结构的光致电荷动力学。研究发现，电荷动力学与过去在类似系统中深入研究的能量动力学有很大的不同。结果表明，具有可调谐相对相位的双色光源提供了一种通过简单而有趣的控制机制来控制电荷动力学的机会，即电荷的时间演化直接与源场的瞬时值相关。因此，我们能够塑造激光脉冲并调整它们的相对相位和幅度的能力直接转化为在金属纳米粒子阵列中操纵电荷振荡的可能性。
