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Composite film with anisotropically enhanced optical nonlinearity for pulse-width tunable fiber laser

Abstract

One-dimensional nanomaterials usually possess unique anisotropic chemical or physical properties. For practical device applications, one of the biggest challenges is their large-scale assembly with predesigned architecture to render optimized collective properties. Based on our previous works, here we report on an extended investigation on the macroscopically aligned assembly of gold nanorods with tunable aspect ratio (AR) in transparent polymer films based on the electrospinning technique. Optical properties of the composite films were investigated by polarized extinction spectra and Z-scan technique. Due to the collective longitudinal LSPR of the macroscopically aligned gold nanorods, the transparent composite films exhibited anisotropically enhanced optical nonlinearity. Intensity of the nonlinear optical signal of the films can be tuned by varying the polarization direction of the laser on the films. Moreover, influence from the AR and doping concentration of GNRs to the optical properties of the composite films was also investigated. To demonstrate an example of practical applications, the composite film was employed as a saturable absorber to construct pulsed fiber laser. Inspiringly, pulsed fiber laser with switchable mode-locking and Q-switching operation modes was realized successfully. The switching of the operation mode of the laser can be triggered simply through variation of the laser’s polarization direction. Such pulse-width tunable fiber laser is potentially useful in various application scenarios.

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Publication details

The article was received on 15 Aug 2017, accepted on 21 Dec 2017 and first published on 21 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC03711B
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Composite film with anisotropically enhanced optical nonlinearity for pulse-width tunable fiber laser

    Z. Ma, H. Zhang, Z. Hu, J. Gan, C. Yang, Z. Luo, T. Qiao, M. Peng, G. Dong, Z. Yang, F. Wise and J. Qiu, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03711B

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