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Two-photon near-field mapping of local molecular orientations in hexaphenyl nanofibers

✍ Scribed by J. Beermann; S.I. Bozhevolnyi; F. Balzer; H.-G. Rubahn

Publisher: John Wiley and Sons
Year: 2005
Tongue: English
Weight: 278 KB
Volume: 2
Category: Article
ISSN: 1612-2011
DOI: 10.1002/lapl.200510028

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✦ Synopsis

Two-photon excited near field images of hexaphenyl
nanofibers are obtained using a scanning near field optical
microscope in transmission configuration. From polarized
measurements the orientations of the molecular basis units of the
fibers are determined with a resolution of better than 400 nm. The
molecular orientation angles obtained are comparable to results
from two-photon scanning far-field microscopy, but the present
measurements provide a better spatial resolution. From this
near-field data it is concluded that the molecules can be oriented
either very homogeneously or with some scatter in otherwise
similar organic nanoaggregates.

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Two-photon mapping of molecular orientations in hexaphenyl microrings

✍ J. Beermann; C. Marquart; S. I. Bozhevolnyi 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 308 KB

Using a far-field second harmonic scanning optical microscope with a tightly focused beam being incident perpendicular to the surface, we have observed two-photon luminescence from microrings consisting of organic hexaphenyl molecules that form ringlike (diameter ≈ 5 μm), ≈ 500-nm-high and very thin