期刊
NANO LETTERS
卷 19, 期 1, 页码 158-164出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b03564
关键词
Ultrafast; carbon nanotubes; multiphoton; photoemission; photocathode; depolarization effect
类别
资金
- US Air Force Research Lab Summer Faculty Fellowship Program
- Air Force Office of Scientific Research (AFOSR) [FA9550-15-1-0370]
- Robert A. Welch Foundation [C-1509, C-1668]
- NASA Space Technology Research Fellowship (NSTRF14) [NNX14AL71H]
Ultrashort bunches of electrons, emitted from solid surfaces through excitation by ultrashort laser pulses, are an essential ingredient in advanced X-ray sources, and ultrafast electron diffraction and spectroscopy. Multiphoton photo-emission using a noble metal as the photocathode material is typically used but more brightness is desired. Artificially structured metal photocathodes have been shown to enhance optical absorption via surface plasmon resonance but such an approach severely reduces the damage threshold in addition to requiring state-of-the-art facilities for photocathode fabrication. Here, we report ultrafast photoelectron emission from sidewalls carbon nanotubes. We utilized strong exciton resonances inherent in this prototypical one-dimensional material, and its excellent thermal conductivity and mechanical rigidity leading to a high damage threshold. We obtained unambiguous evidence for resonance-enhanced multiphoton photoemission processes with definite power-law behaviors. In addition, we observed strong polarization dependence and ultrashort photoelectron response time, both of which can be quantitatively explained by our model. These results firmly establish aligned single-wall carbon nanotube films as novel and promising ultrafast photocathode material.
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