期刊
NANO LETTERS
卷 14, 期 7, 页码 3773-3778出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl5006959
关键词
Optical antenna; carbon nanotube; nanoscale devices; photocurrent; electroluminescence
类别
资金
- ERC through the starting Grant NEWNANOSPEC
- Deutsche Forschungsgemeinschaft (DFG) through the Nanosystems Initiative Munich (NIM)
We report on the first antenna-enhanced optoelectronic microscopy studies on nanoscale devices. By coupling the emission and excitation to a scanning optical antenna, we are able to locally enhance the electroluminescence and photocurrent along a carbon nanotube device. We show that the emission source of the electroluminescence can be pointlike with a spatial extension below 20 nm. Topographic and antenna-enhanced photocurrent measurements reveal that the emission takes place at the location of highest local electric field indicating that the mechanism behind the emission is the radiative decay of excitons created via impact excitation.
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