Two-photon absorption measurement has been carried out in a single 80 nm X 10 μm ZnO nanowire using femtosecond laser pulses in the wavelength range of 700-800 nm. In addition to the deep-level green emission around 530 nm due to surface defects and the near band-edge ultraviolet emission around 360 nm 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.
展开▼
机译：已经使用波长范围为700-800 nm的飞秒激光脉冲在单个80 nm X 10μmZnO纳米线中进行了双光子吸收测量。除了由于表面缺陷导致的约530 nm的深绿色发射光和由于激子引起的约360 nm的近带边紫外发射之外，还观察到了二次谐波峰。发现当双光子吸收波长朝向纳米线的激子波长调谐时，倍频分量的强度增强。此行为可归因于ZnO纳米线中的共振激子吸收。
展开▼
