CUED Publications database

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

Xu, S and Wang, F and Zhu, C and Meng, Y and Liu, Y and Liu, W and Tang, J and Liu, K and Hu, G and Howe, RCT and Hasan, T and Zhang, R and Shi, Y and Xu, Y (2016) Ultrafast nonlinear photoresponse of single-wall carbon nanotubes: A broadband degenerate investigation. Nanoscale, 8. pp. 9304-9309. ISSN 2040-3364

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Abstract

© 2016 The Royal Society of Chemistry. 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.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:07
Last Modified: 25 Jun 2020 08:53
DOI: 10.1039/c6nr00652c