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

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Xu, Shuo 
Wang, Fengqiu 
Zhu, Chunhui 
Meng, Yafei 
Liu, Yujie 

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.

0205 Optical Physics
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Royal Society of Chemistry (RSC)
This work is supported by the National Key Basic Research Program of China (2014CB921101), the National Natural Science Foundation of China (61378025,61450110087,61427812,51522201,11474006), Jiangsu Province Shuangchuang Team program, and State Key Laboratory of Advanced Optical Communication Systems Networks, China