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this agreement may be fortuitous. An alter-native model, based on the product of e

Summary: this agreement may be fortuitous. An alter-
native model, based on the product of e
h currents, gives a poor description of the
relative intensities but a good description of
the peak width for Vd 8 V. The key point
is that the maximum in emission at Vg Vd/2
is a clear signature of emission caused by
carrier recombination in an ambipolar Schot-
tky barrier transistor.
The optical emission from the nanotube de-
vices was further characterized by measuring its
polarization. For this purpose, an IR polarizer
was inserted between the sample and the IR
camera. Figure 4A presents an example of a
polar plot showing the intensity of the IR emis-
sion (red dots) as a function of the polarization
angle from a device operating with Vg 4 V and
Vd 8 V. The carbon nanotube is expected to be
a linearly polarized dipole radiation source.


Source: Allen, Richard M. - Seismological Laboratory, Department of Earth and Planetary Science, University of California at Berkeley


Collections: Geosciences