Ultrafast nonlinear photoresponse of single-wall carbon nanotubes: a broadband degenerate investigation. / Liu, Wenqing.

In: nanoscale, Vol. 8, 30.03.2016, p. 9304-9309.

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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.
Original languageEnglish
Pages (from-to)9304-9309
Number of pages6
Journalnanoscale
Volume8
DOIs
Publication statusPublished - 30 Mar 2016
This open access research output is licenced under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

ID: 27277530