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Huazhong University of Science and Technology determines the crystal orientation of ZnS nanowires by SHG polarization response

Huazhong University of Science and Technology determines the crystal orientation of ZnS nanowires by SHG polarization response

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  • Time of issue:2022-05-28
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(Summary description)Second harmonic wave (SHG) is a typical nonlinear optical phenomenon. The fundamental frequency light of a certain intensity passes through the nonlinear optical crystal, and the second harmonic signal of double frequency is generated.

Huazhong University of Science and Technology determines the crystal orientation of ZnS nanowires by SHG polarization response

(Summary description)Second harmonic wave (SHG) is a typical nonlinear optical phenomenon. The fundamental frequency light of a certain intensity passes through the nonlinear optical crystal, and the second harmonic signal of double frequency is generated.

  • Categories:Knowledge
  • Author:
  • Origin:
  • Time of issue:2022-05-28
  • Views:0
Information

Second harmonic wave (SHG) is a typical nonlinear optical phenomenon. The fundamental frequency light of a certain intensity passes through the nonlinear optical crystal, and the second harmonic signal of double frequency is generated. The second harmonic polarization of a crystal is very sensitive to the crystal lattice orientation. Previous research directions usually only consider the effect of the crystal c-axis orientation on the second harmonic polarization response, while ignoring the effects of the other two axes of the crystal.

Professor Lu Peixiang's team from Huazhong University of Science and Technology used a femtosecond laser with a center wavelength of 810nm as the pump source. , the orientation of the other two axes will also affect the corresponding curve. Accordingly, the orientations of all crystal axes of the ZnS crystal can be deduced from the SHG polarization response curve.

HRTEM results show that this method of all-optical in-situ determination of crystal orientation has high precision; compared with traditional electron diffraction methods, this work provides a new method of all-optical, non-destructive, in-situ determination of crystal orientation . The work also systematically studied the effect of the change of ZnS crystal azimuth (γ, ω, φ) on the SHG polarization response flower shape, which provided the main experimental basis for the preparation of nonlinear optical devices and polarized low-light devices. In addition, the SHG conversion power of ZnS nanowires measured in the experiment is as high as 7×10-6, indicating that ZnS nanowires have potential application value in micro-nano ultraviolet light sources, nonlinear optical microscopy imaging and so on.

The results of this research were published in the recent journal NanoLett (NanoLett., 2015, 15, 3351–3357, DOI: 10.1021/acs.nanolett.5b00607).

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