Exciton Dynamics: Ultrafast Exciton Dynamics and Two-Photon Pumped Lasing from ZnSe Nanowires (Advanced Optical Materials 4/2013)

Authors

  • Guichuan Xing,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
    2. Energy Research Institute @ NTU (ERI@N), 1 CleanTech Loop, Singapore
    3. Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE), Singapore
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  • Jingshan Luo,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
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  • Hongxing Li,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
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  • Bo Wu,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
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  • Xinfeng Liu,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
    2. Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE), Singapore
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  • Cheng Hon Alfred Huan,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
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  • Hong Jin Fan,

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
    2. Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE), Singapore
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  • Tze Chien Sum

    Corresponding author
    1. Energy Research Institute @ NTU (ERI@N), 1 CleanTech Loop, Singapore
    2. Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE), Singapore
    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
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Abstract

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The commonly accepted paradigm that the higher pump intensities needed for two photon excitation (TPE) correspond to a higher exciton density threshold for two-photon pumped lasing (nth) is re-examined by T.-C. Sum and co-workers using femtosecond time-resolved spectroscopy. The results on page 319 show that a much lower nth is needed to achieve lasing in single ZnSe nanowires with TPE compared to single photon excitation (SPE). This finding has significant implications for the photostability and durability of nanowire lasing.

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