Graphene derivatives, possessing strong Raman scattering and near-infrared absorption intrinsically, have boosted many exciting biosensing applications. The tunability of the absorption characteristics, however, remains largely unexplored to date. Here, we proposed a multilayer configuration constructed by a graphene monolayer sandwiched between a buffer layer and one-dimensional photonic crystal (1DPC) to achieve tunable graphene absorption under total internal reflection (TIR). It is interesting that the unique optical properties of the buffer-graphene-1DPC multilayer structure, the electromagnetically induced transparency (EIT)-like and Fano-like absorptions, can be achieved with pre-determined resonance wavelengths, and furtherly be tuned by adjusting either the structure parameters or the incident angle of light. Theoretical analyses demonstrate that such EIT- and Fano-like absorptions are due to the interference of light in the multilayer structure and the complete transmission produced by the evanescent wave resonance in the configuration. The enhanced absorptions and the huge electrical field enhancement effect exhibit potentials for broad applications, such as photoacoustic imaging and Raman imaging.

中文翻译：

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用于生物传感的石墨烯多层结构中的可调吸收特性

石墨烯衍生物本质上具有强拉曼散射和近红外吸收，促进了许多令人兴奋的生物传感应用。然而，迄今为止，吸收特性的可调性在很大程度上仍未得到探索。在这里，我们提出了一种多层结构，由夹在缓冲层和一维光子晶体 (1DPC) 之间的石墨烯单层构成，以实现全内反射 (TIR) 下的可调谐石墨烯吸收。有趣的是，缓冲-石墨烯-1DPC 多层结构的独特光学特性，电磁感应透明 (EIT) 类和 Fano 类吸收，可以通过预先确定的共振波长实现，并进一步通过调整结构参数或光的入射角。理论分析表明，这种类似 EIT 和 Fano 的吸收是由于多层结构中光的干涉和结构中的倏逝波共振产生的完全透射。增强的吸收和巨大的电场增强效应显示出广泛应用的潜力，例如光声成像和拉曼成像。