金属表面等离子体激发的实时场分布研究

The real-time field distribution excited by metal surface plasmon

利用时域有限差分法的电磁场仿真软件建立了金属-绝缘体-金属波导结构模型,并通过持续扩展光源激发该波导结构产生表面等离子体波,研究了金属表面等离子体激发的实时场分布.结果表明,表面等离子体波的各电磁场分量可以沿着金属-绝缘体的接触面传播,但传播距离有限,且垂直于接触面向两侧指数衰减.

A metal-insulator-metal waveguide structure model was established using the electro-magnetic field simulation software based on the finite difference time domain(FDTD).To generate the surface plasmon wave,a continuous diffused light source was used to excite this structure.The real-time field distribution of the plasmon wave was studied.The results show that the field components of the surface plasmon wave can be propagated a certain distance along the contact surface of the metal-insulator.The wave energy is attenuated exponentially along the vertical direction of the contact surface.