Browsing by Author "Li, H. F."

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    Characterizing ultrashort optical pulses using second-order nonlinear nanoprobes
    Li, H. F.; Zhang, Z.; Xu, Q. A.; Shi, K. B.; Jia, Y. S.; Zhang, B. G.; Xu, Yong; Liu, Z. W. (AIP Publishing, 2010-12-01)
    We report a second-order nonlinear nanoprobe for characterizing ultrafast optical near fields. The proposed nanoprobe comprises second harmonic nanocrystals attached to a carbon nanotube, which is in turn attached to a silica fiber taper. We demonstrate in situ pulse characterization directly in the air core of a photonic crystal fiber. Further, it is shown that nanoprobes containing a single nanocrystal in the tip of the nanotube can be fabricated by auxiliary focused ion beam nanomilling. These results indicate that the proposed nanoprobe can open an avenue for probing the evolution of ultrafast optical fields in complex three-dimensional micro-or nanostructures. (C) 2010 American Institute of Physics. [doi:10.1063/1.3532112]
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    Development of a nonlinear nanoprobe for interferometric autocorrelation based characterization of ultrashort optical pulses
    Li, H. F.; Jia, Y. S.; Xu, Q.; Shi, K. B.; Wu, J.; Eklund, P. C.; Xu, Yong; Liu, Z. W. (AIP Publishing, 2010-01-01)
    Near-field scanning can achieve nanoscale resolution while ultrashort pulse diagnostic tools can characterize femtosecond pulses. Yet currently it is still challenging to nonperturbatively characterize the near field of an ultrashort optical pulse with nanofemtoscale spatiotemporal resolution. To address this challenge, we propose to develop a nonlinear nanoprobe composed of a silica fiber taper, a nanowire, and nonlinear fluorescent spheres. Using such a nanoprobe, we also report proof-of-principle characterization of femtosecond optical pulse through interferometric autocorrelation measurement.