A Plasmon-Mediated Electron Emission Process
A Plasmon-Mediated Electron Emission Process
复制标题
等离激元介导的电子发射过程
DOI：
10.1021/acsnano.8b08444
复制
发表时间：
2019-02-01
期刊：
影响因子：
17.1
通讯作者：
Deng, Shaozhi
中科院分区：
文献类型：
--
作者：
Shen, Yan;Chen, Huanjun;Deng, Shaozhi
Light-driven electron emission plays an important role in modern optoelectronic devices. However, such a process usually requires a light field with either a high intensity or a high frequency, which is not favorable for its implementations and difficult for its integrations. To solve these issues, we propose to combine plasmonic nanostructures with nanoelectron emitters of low work function. In such a heterostructure, hot electrons generated by plasmon resonances upon light excitation can be directly injected into the adjacent emitter, which can subsequently be emitted into the vacuum. Electron emission of high efficiency can be obtained with light fields of moderate intensities and visible wavelengths, which is a plasmon-mediated electron emission (PMEE) process. We have demonstrated our proposed design using a gold-on-graphene (Au-on-Gr) nanostructure, which can have electron emission with light intensity down to 73 mW.cm(-2). It should be noted that the field electron emission is not involved in such a PMEE process. This proposal is of interest for applications including cold-cathode electron sources, advanced photocathodes, and micro- and nanoelectronic devices relying on free electrons.
