Abstract
Two-photon absorption measurement has been carried out in a single 80nm×10μm ZnO nanowire using femtosecond laser pulses in the wavelength range of 700–800nm. In addition to the deep-level green emission around 530nm due to surface defects and the near band-edge ultraviolet emission around 360nm due to the exciton, a second harmonic peak has been observed. The strength of the frequency-doubled component is found to enhance while the two-photon absorption wavelength is tuned towards the exciton wavelength of the nanowire. This behavior can be ascribed to the resonant exciton absorption in ZnO nanowires.
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