Near-field imaging of organic nanofibres.
The optical near-field of orientated nanofibres of para-hexaphenyl was investigated by a combination of localized far-field ultraviolet excitation and scanning near-field fluorescence detection. Morphological inhomogeneities of the nanofibres together with selective incoupling into the near-field probe resulted in a detection sensitivity was dependent on individual nanoaggregates. Strongest near-field intensity and radiation into the far-field were observed at the crossing points of nanofibres. The near-field observation of a distance-dependent damping of the waveguiding along the nanofibres allowed us to determine the imaginary part of the dielectric function of the nanofibres, in quantitative agreement with far-field optical data.
Volkov
V S
VS
Institute of Physics and Nanotechnology, Aalborg University, Pontoppidanstraede 103, DK-9920 Aalborg, Denmark. volkov@physics.auc.dk
Bozhevolnyi
S I
SI
Bordo
V G
VG
Rubahn
H-G
HG