Fano resonance (FR) holds promising applications for high performance optoelectronic devices due to its strong enhancement of light-matter interactions. In this work, we experimentally demonstrate a tunable FR in a photonic crystal nanoresonator (PCR), including the effects of structural parameters and graphene nanosheets with different layer numbers. The results show that the intensity and position of Fano peaks can be tuned via altering the lattice constant and the hole radius of PCR due to the variation of the effective refractive index. More importantly, we experimentally study the interaction between sharp FR with multilayer graphene. The results indicate that the FR transmission spectrum can be efficiently adjusted with the layer number of graphene, and the largest change in transmission (∼44%) is achieved with three-layer graphene because of high conductivity. These consequences may lead to efficient and tunable electro-optical modulators, biosensors, and optical switches in the near-infrared region.

中文翻译：

---

在近红外区域使用多层石墨烯的可调谐 Fano 谐振器

法诺共振（FR）由于其强烈增强光-物质相互作用而在高性能光电器件中具有广阔的应用前景。在这项工作中，我们通过实验证明了光子晶体纳米谐振器 (PCR) 中的可调 FR，包括结构参数和具有不同层数的石墨烯纳米片的影响。结果表明，由于有效折射率的变化，可以通过改变 PCR 的晶格常数和孔半径来调整 Fano 峰的强度和位置。更重要的是，我们通过实验研究了尖锐 FR 与多层石墨烯之间的相互作用。结果表明，FR透射光谱可以通过石墨烯的层数进行有效调整，由于具有高导电性，三层石墨烯实现了最大的透射率变化（~44%）。这些结果可能会导致近红外区域中高效且可调的电光调制器、生物传感器和光开关。