Electron energy-gain spectroscopy
Electron energy-gain spectroscopy
复制标题
DOI：
10.1088/1367-2630/10/7/073035
复制
发表时间：
2008-07-21
影响因子：
3.3
通讯作者：
Kociak, M.
中科院分区：
文献类型：
--
作者：
de Abajo, F. J. Garcia;Kociak, M.
我们引入电子能量增益谱作为一种工具，利用透射电子显微镜配备外部光学照明的纳米结构系统的局部光激发产生的信息。新的光谱学将电子显微镜的高超空间分辨率与前所未有的低于毫电子伏水平的能量分辨率相结合，仅受外部光的带宽限制。能量增益事件的分析应该揭示单个纳米结构光学响应的超精细细节（例如纳米颗粒中的等离子体激元）。我们的结论依赖于一个一般的形式主义，能够描述光吸收的快速电子在真空中移动附近的照明纳米结构，从而铺平了道路，走向新的光辅助电子和离子加速计划。能量增益概率被证明是可比的能量损失实验中观察到的合理的照明强度。
We introduce electron energy-gain spectroscopy as a tool to yield information on local optical excitations of nanostructured systems using transmission electron microscopes equipped with external optical illumination. The new spectroscopy combines the superb spatial resolution of electron microscopes with unprecedented energy resolution below the milli-electron-volt level, only limited by the bandwidth of the external light. The analysis of energy gain events should reveal hyperfine details in the optical response of individual nanostructures (eg plasmons in nanoparticles). Our conclusions rely on a general formalism capable of describing light absorption by fast electrons moving in vacuum near an illuminated nanostructure, thus paving the way towards new light-assisted electron-and ion-acceleration schemes. Energy gain probabilities are shown to be comparable to those observed in energy loss experiments for reasonable illumination intensity.