Graphene is an important material for the design of flexible and stretchable electronic and optoelectronic devices on account of its high Young’s modulus and generation of highly confined surface plasmons. In this work, we report the near to far-infrared (FIR) input frequencies required to generate the maximum electric field and magnetic field for the efficient propagation of surface plasmons for differently doped, micron-long, free-standing and poly(methyl methacrylate) (PMMA) sandwiched graphene sheets. The effect of the variation of doping of graphene, graphene sheet length and bent angle of the graphene sheet on the propagating electromagnetic field is analysed at the obtained input excitation frequencies using finite element method. Low attenuation of 0.034 and 0.234 dB along with relatively high confinement of ~6 and ~13 nm for the surface plasmons are achieved for micron-long, bent, highly doped, freely suspended and PMMA sandwiched graphene sheets at 193.5 and 190 THz, respectively. The knowledge of these optimized NIR–FIR input excitation frequencies producing maximum electric and magnetic field output at the end of graphene sheet is useful for designing compact and efficient graphene-based flexible and wearable devices for medical imaging applications.

中文翻译：

---

柔性独立式和 PMMA 夹层石墨烯在优化近红外频率下的高效表面等离子体传播

由于其高杨氏模量和高度受限的表面等离子体的产生，石墨烯是设计柔性和可拉伸电子和光电器件的重要材料。在这项工作中，我们报告了产生最大电场和磁场所需的近远红外 (FIR) 输入频率，以有效传播不同掺杂、微米长、独立和聚甲基丙烯酸甲酯的表面等离子体激元。 ) (PMMA) 夹层石墨烯片。使用有限元方法在获得的输入激励频率下分析石墨烯掺杂、石墨烯片长度和石墨烯片弯曲角的变化对传播电磁场的影响。0.034 和 0 的低衰减。对于微米长、弯曲、高掺杂、自由悬浮和 PMMA 夹层的石墨烯片，分别在 193.5 和 190 THz 处实现了 234 dB 以及相对较高的~6 和~13 nm 的表面等离子体。这些优化的 NIR-FIR 输入激励频率在石墨烯片末端产生最大电场和磁场输出的知识对于为医学成像应用设计紧凑且高效的基于石墨烯的柔性和可穿戴设备非常有用。