Nonlinear optical properties of near-infrared region Ag2S quantum dots pumped by nanosecond laser pulses

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Abstract

This study investigates near-infrared region Ag2S quantum dots (QDs) and their nonlinear optical response under 532 nm nanosecond laser pulses. Our experimental result shows that nonlinear transmission is reduced from 0.084 to 0.04. The observed narrowing behavior of the output pulse width shows superior optical limiting. We discuss the physical mechanisms responsible for the nonlinear optical response of the QDs. The average size of the nanocrystals was 5.5 nm. Our results suggest the possibility of using these Ag2S QDs for photoelectric, biosensor, optical ranging, and self-adaptive technologies.

Figures

  • Figure 1: (a) Absorption spectra of Ag2S QDs in chloroform, the TEM image of Ag2S QDs is shown in the inset. (b) EDS spectra of Ag2S QDs.
  • Figure 2: Simulation model (a) and result (b).
  • Table 1: Simulation parameters.
  • Figure 3: Experimental setup.
  • Figure 4: (a) Open-aperture Z-scan graph of Ag2S QDs; (b) closed-aperture Z-scan graph of Ag2S QDs.
  • Figure 5: Measured nonlinear transmission versus the input pulse energy for Ag2S QDs. The dashed line represents the best fitting curve based on Equation 3 with β = constant.
  • Table 2: Fitted nonlinear optical parameter of Ag2S QDs for open-aperture Z-scans.a
  • Table 3: Fitted nonlinear optical parameter of Ag2S QDs for closed-aperture Z-scans.a

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CITATION STYLE

APA

Liu, L. W., Hu, S. Y., Dou, Y. P., Liu, T. H., Lin, J. Q., & Wang, Y. (2015). Nonlinear optical properties of near-infrared region Ag2S quantum dots pumped by nanosecond laser pulses. Beilstein Journal of Nanotechnology, 6(1), 1781–1787. https://doi.org/10.3762/bjnano.6.182

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