期刊
ACS NANO
卷 13, 期 2, 页码 1977-1989出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b08444
关键词
plasmon-mediated electron emission (PMEE); Au-on-Gr nanostructure; electromagnetic field; hot electrons; vacuum electron emission
类别
资金
- National Natural Science Foundation of China [51290271, 51702372, 91833301]
- National Key Basic Research Program of China [2013CB933601]
- Guangdong Natural Science Funds for Distinguished Young Scholars [2014A030306017]
- Guangdong Special Support Program [201428004]
- Pearl River S&T Nova Program of Guangzhou [201610010084]
- Fundamental Research Funds for the Central Universities
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.
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