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Issue 17, 2016
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Ultrafast nonlinear photoresponse of single-wall carbon nanotubes: a broadband degenerate investigation

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Abstract

Understanding of the fundamental photoresponse of carbon nanotubes has broad implications for various photonic and optoelectronic devices. Here, Z-scan and pump–probe spectroscopy performed across 600–2400 nm were combined to give a broadband ‘degenerate’ mapping of the nonlinear absorption properties of single-wall carbon nanotubes (SWNTs). In contrast to the views obtained from non-degenerate techniques, sizable saturable absorption is observed from the visible to the near-infrared range, including the spectral regions between semiconducting excitonic peaks and metallic tube transitions. In addition, the broadband mapping unambiguously reveals a photobleaching to photoinduced absorption transition feature within the first semiconducting excitonic band ∼2100 nm, quantitatively marking the long-wavelength cut-off for saturable absorption of the SWNTs investigated. Our findings present a much clearer physical picture of SWNTs’ nonlinear absorption characteristics, and help provide updated design guidelines for SWNT based nonlinear optical devices.

Graphical abstract: Ultrafast nonlinear photoresponse of single-wall carbon nanotubes: a broadband degenerate investigation

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Publication details

The article was received on 25 Jan 2016, accepted on 28 Mar 2016 and first published on 30 Mar 2016


Article type: Paper
DOI: 10.1039/C6NR00652C
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Nanoscale, 2016,8, 9304-9309

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    Ultrafast nonlinear photoresponse of single-wall carbon nanotubes: a broadband degenerate investigation

    S. Xu, F. Wang, C. Zhu, Y. Meng, Y. Liu, W. Liu, J. Tang, K. Liu, G. Hu, R. C. T. Howe, T. Hasan, R. Zhang, Y. Shi and Y. Xu, Nanoscale, 2016, 8, 9304
    DOI: 10.1039/C6NR00652C

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