Journal
NANOSCALE
Volume 8, Issue 17, Pages 9304-9309Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr00652c
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Funding
- National Key Basic Research Program of China [2014CB921101]
- National Natural Science Foundation of China [61378025, 61450110087, 61427812, 51522201, 11474006]
- Jiangsu Province Shuang-chuang Team program
- State Key Laboratory of Advanced Optical Communication Systems Networks, China
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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 similar to 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.
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