title: Antenna-enhanced optoelectronic probing of carbon nanotubes.
abstract: 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.
authors.affiliation: Department Chemie und Center for NanoScience (CeNS), Ludwig-Maximilians-Universität , 81377 München, Germany.
authors.forename: Nina
authors.initials: N
authors.lastname: Mauser
authors.forename: Nicolai
authors.initials: N
authors.lastname: Hartmann
authors.forename: Matthias S
authors.initials: MS
authors.lastname: Hofmann
authors.forename: Julia
authors.initials: J
authors.lastname: Janik
authors.forename: Alexander
authors.initials: A
authors.lastname: Högele
authors.forename: Achim
authors.initials: A
authors.lastname: Hartschuh
mesh_terms: D055664:Electrochemical Techniques / Q000295:instrumentation*; D008163:Luminescent Measurements / Q000295:instrumentation*; D018613:Microscopy, Confocal / Q000295:instrumentation*; D037742:Nanotubes, Carbon / Q000737:chemistry / Q000648:ultrastructure*
chemical_list: D037742:Nanotubes, Carbon