The demand for novel optoelectronic and photonic technologies has fueled an intense research effort to synthesize and
characterize nanostructured semiconductor materials with unique properties that lend themselves to technological
innovation. Zinc Oxide has emerged as an attractive candidate for a variety of applications, due in part to a large second
order nonlinear susceptibility, its wide band-gap and large exciton binding energy. We have used time-resolved
nonlinear two-photon emission and second harmonic generation microscopy to characterize the optical properties and
excited state dynamics of individual rods. Ultrafast emission microscopy is used to follow the trapping dynamics of
photoexcited charge carriers. Our results show a time-dependent red-shift in the trap emission band that is interpreted as
arising from carrier percolation through trap states. In a second series of experiments, second harmonic generation
(SHG) microscopy illustrates the connection between the optical mode structure of the object and its nonlinear mixing
efficiency. Images show a periodic modulation in the SHG efficiency that is symmetrically situated relative to the rod
midpoint. This phenomenon arises when the fundamental optical field couples into standing wave resonator modes of the
structure and is a direct manifestation of the tapered shape of the rod.
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