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Cubic to amorphous transformation of Se in silica with improved ultrafast optical nonlinearity

机译:具有改进超快光学非线性的二氧化硅中Se的立方体与SE的无定形转化

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摘要

We report a cubic to amorphous transformation of selenium in silica xerogel prepared through a sol-gel route. The crystalline nature of the nanoparticles examined from the SAED pattern and HRTEM revealed an alpha-cubic structure. The band gap energies calculated from the UV-vis absorption measurements showed a higher band gap of 3.5 eV for the cubic form compared to 2.4 eV for the amorphous form. The ultrafast optical nonlinearity of the samples was investigated by an open aperture Z-scan at 800 nm using 100 fs laser pulses. Although doping with cubic Se did not improve the optical limiting efficiency of silica xerogels, doping with amorphous Se results in substantial enhancement. Numerical analysis of the Z-scan data attributed the nonlinearity to two-photon and three-photon absorption and two-photon induced free carrier absorption. These intensity-dependent, instantaneous nonlinearities make amorphous Se doped silica xerogels attractive candidates for the design of ultrafast optical limiter devices.
机译:我们向通过溶胶 - 凝胶途径制备的二氧化硅Xerogel中硒的无定形转化立方体。从起草图案和HRTEM检查的纳米颗粒的结晶性揭示了α立方结构。根据UV-Vis吸收测量计算的带隙能量显示与无定形形式的2.4eV相比,立方体形状的3.5eV的较高带隙。通过使用100 fs激光脉冲,通过800nm处的开口孔径z扫描研究样品的超快光学非线性。虽然掺杂立方体SE未提高二氧化硅Xerogels的光学限制效率,但掺杂与无定形SE产生显着的增强。 Z扫描数据的数值分析将非线性与双光子和三光子吸收和双光子诱导的自由载体吸收归因于非线性。这些强度依赖性瞬时非线性使无定形的SE掺杂的硅氧化硅Xerogels具有吸引力的候选人,用于超快光学限制器装置的设计。

著录项

  • 来源
    《RSC Advances》 |2015年第18期|共8页
  • 作者单位

    Mahatma Gandhi Univ Sch Pure &

    Appl Phys Kottayam 686560 Kerala India;

    Mahatma Gandhi Univ Sch Pure &

    Appl Phys Kottayam 686560 Kerala India;

    Raman Res Inst Light &

    Matter Phys Grp Bangalore 560080 Karnataka India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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