典型金属纳米结构的电子能量损失谱研究

Research on Electron Energy Loss Spectroscopy of Typical Metal Nanostructures

利用格林函数推导出金属纳米结构电子能量损失谱的计算公式,基于时域有限差分方法对几种典型的结构进行建模仿真,数值模拟运动电荷和结构的距离、液晶环境材料对电子能量损失谱的调节作用.仿真结果表明:当增加电子与纳米结构的距离时,电子能量损失谱谱峰降低;当添加液晶材料或各向同性衬底材料时,电子能量损失谱的峰值发生明显红移,但液晶的光轴倾角改变对峰值的调制作用有限.通过计算电子能量损失谱研究金属纳米结构表面等离子激元共振特性,为高度复杂的等离子体激元纳米结构的设计提供了理论基础.

The formula of electron energy loss spectroscopy of metal nanostructures was deduced by Green function.Several typical structural systems were simulated by finite difference time-domain method.The regulating effects of the distance between the moving charge and the structure,and the liquid crystal environment on the electron energy loss spectrum were numerical simulated.The simulation results show that the electron energy loss spectral peak decreases when the distance between electron and nanostructure is increased.When the liquid crystal material or isotropic substrate material is added,the peak value of electron energy loss spectrum is redshift,but with the tilt angle of the optical axis changes,the modulation effect is limited.The surface plasmon resonance on metal nanoparticles can be studied by calculating the electron energy loss spectrum,which provides a basis theoretical for the design of highly complex plasmonic nanostructures.