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Intensity mediated change in the sign of ultrafast third-order nonlinear optical response in As2S2 thin films

机译:强度介导的超快三阶非线性光学响应符号的变化在AS2S2薄膜中

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摘要

We study experimentally and theoretically the intensity-dependent off-resonant ultrafast third-order nonlinear optical response of As(2)S(2 )thin films. At low intensity, we observed saturable absorption with a negative (self-defocusing) nonlinear refractive index (n(2)) which at higher intensity switched over to reverse saturable absorption with a change in the sign of n(2) to positive (self-focusing). Our findings constitute compelling evidence on how to dynamically tune the optical response with the intensity that has its origin in the combined effect of two-photon absorption and Pauli blocking. The results were explained with the help of time-resolved measurements and rigorous theoretical and numerical simulations. (C) 2018 Optical Society of America
机译:我们在实验和理论上研究了AS(2)S(2)薄膜的强度依赖性的离谐振超速度三阶非线性光学响应。 在低强度下,我们观察到恒定(自离焦)非线性折射率(N(2))的可饱和吸收,其在更高的强度切换到反向可饱和的吸收,并在N(2)的符号中的变化为正(自我 - 汇集)。 我们的调查结果构成了有关如何动态调整光学响应的令人信服的证据,该响应具有其起源的强度,在两光膜吸收和保罗利阻塞的综合作用中。 借助时间解决的测量和严格的理论和数值模拟来解释结果。 (c)2018年光学学会

著录项

  • 来源
    《Optics Letters》 |2018年第19期|共4页
  • 作者单位

    Indian Inst Sci Educ &

    Res Dept Phys Bhopal 462066 India;

    Indian Inst Sci Educ &

    Res Dept Phys Bhopal 462066 India;

    Indian Inst Sci Educ &

    Res Dept Phys Bhopal 462066 India;

    Indian Inst Sci Educ &

    Res Dept Phys Bhopal 462066 India;

    Indian Inst Sci Educ &

    Res Dept Phys Bhopal 462066 India;

    Univ Pardubice Fac Chem Technol Dept Graph Arts &

    Photophys Pardubice 53210 Czech Republic;

    Univ Pardubice Fac Chem Technol Dept Graph Arts &

    Photophys Pardubice 53210 Czech Republic;

    Indian Inst Sci Educ &

    Res Dept Phys Bhopal 462066 India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 计量学;光学;
  • 关键词

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