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. 2015 Apr 21;6:6851. doi: 10.1038/ncomms7851

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Gate-controlled optical properties of all-fibre devices with (a) bi- and (b) quad-layer graphenes. Stronger graphene–light interaction leads to enhanced non-resonant optical transmission change of 72.9% (bilayer) and 90.1% (quad-layer). Corresponding electrical transport properties of devices with (c) bi- and (d) quad-layer graphenes. (e) Statistical analysis of Raman spectroscopic measurements. Histograms show the relative peak intensity of the Raman signal between 2D-peaks and G-peaks (I_2D/G). The Raman spectra at several sampling points are shown in the figures on the right side. The monolayer graphene has an almost uniform ratio of 2.9–3.6. The results of multilayer graphene exhibit broad distribution, which indicates that there is significant interlayer coupling in our stacked multilayer graphene.