离子辐照诱导的少层石墨烯纳米片的层压缩和光学性能增强
Layer compression and enhanced optical properties of few-layer graphene nanosheets induced by ion irradiation
摘要：
石墨烯因其独特的性质而被认为是一种具有吸引力的二维材料，在电子和光子器件的基础研究和广泛应用中具有重要意义。调控石墨烯性质的技术一直受到多学科领域研究人员的关注。在这里，我们报告的第一个实验观察的层到层的压缩和增强的光学性能的几层石墨烯纳米片通过施加高能离子束的照射。在照射之后，石墨烯层之间的空间减小，导致少层石墨烯纳米片与衬底表面之间的更紧密接触。这种处理还增强了石墨烯纳米片与表面附近的渐逝场波之间的相互作用，从而增强了石墨烯层的偏振相关光吸收（具有3倍偏振消光比增量）。利用离子辐照石墨烯纳米片作为饱和吸收体，增强了石墨烯纳米片与倏逝场的相互作用，实现了性能显著改善的被动调Q波导激光。获得的波导激光重复频率高达2.3MHz，脉冲宽度为101ns。
英文摘要：
Graphene has been recognized as an attractive two-dimensional material for fundamental research and wide applications in electronic and photonic devices owing to its unique properties. The technologies to modulate the properties of graphene are of continuous interest to researchers in multidisciplinary areas. Herein, we report on the first experimental observation of the layer-to-layer compression and enhanced optical properties of few-layer graphene nanosheets by applying the irradiation of energetic ion beams. After the irradiation, the space between the graphene layers was reduced, resulting in a tighter contact between the few-layer graphene nanosheet and the surface of the substrate. This processing also enhanced the interaction between the graphene nanosheets and the evanescent-field wave near the surface, thus reinforcing the polarization-dependent light absorption of the graphene layers (with 3-fold polarization extinction ratio increment). Utilizing the ion-irradiated graphene nanosheets as saturable absorbers, the passively Q-switched waveguide lasing with considerably improved performances was achieved, owing to the enhanced interactions between the graphene nanosheets and evanescent field of light. The obtained repetition rate of waveguide laser was up to 2.3 MHz with a pulse duration of 101 ns.
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