Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures Page: 28
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tapered fiber probe tip used for measurement. AFM-style probes, on the other hand can
have AFM-quality topography, but generally sacrifice the ability to collect in the near-
field. It is possible to bypass this by having an aperture in the AFM probe tip, however
this generally increases the size of the probe and therefore reduces the topographical
resolution.
For our near-field measurements I made use of a commercial JASCO NFS-330
near-field scanning optical micro-spectrometer (NSOM) using a tapered fiber probe
operating in illumination/collection mode. Fiber probe aperture diameters used varied
HeCd 325 nm
325 nm
Bandpass ND . ............
Filter Filter
Beam Stop
Mirror
Beam Splitter
CCD
Slit . Spectrometer
0
325 nm
Line
Fiber Filter
Au Coated
Probe Tip U
Sample
Figure 3.6 Schematic diagram of Near-field PL experiment. Excitation
provided by the 325 nm line of a HeCd laser is passed through a series
of filters to control the strength and then coupled into a UV fiber to couple
the excitation via to the sample via near-field interactions. The sample
returns emission via near-field interaction with the probe tip back through
the fiber, through a line filter to eliminate the laser line and to the
spectrometer.
28
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Llopis, Antonio. Electrostatic Mechanism of Emission Enhancement in Hybrid Metal-semiconductor Light-emitting Heterostructures, dissertation, May 2012; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc115113/m1/38/?rotate=90: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .