Department Chemie und Center for NanoScience (CeNS), Ludwig-Maximilians-Universität , 81377 München, Germany.
Nano Lett. 2014 Jul 9;14(7):3773-8. doi: 10.1021/nl5006959. Epub 2014 Jun 5.
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.
我们报告了关于纳米器件的首次天线增强光电显微镜研究。通过将发射和激发耦合到扫描光学天线上，我们能够在碳纳米管器件上局部增强电致发光和光电流。我们表明，电致发光的发射源可以是点状的，其空间扩展小于 20nm。形貌和天线增强光电流测量表明，发射发生在局部电场最强的位置，表明发射的机制是通过冲击激发产生的激子的辐射衰减。
