With few-layer black phosphorus (BP)-based one-dimensional photonic crystal (1DPC), a novel optical biosensor based on the guided-mode resonance (GMR) is proposed for enhancing the sensitivity. Due to the strong coupling of the GMR with itself, the resonance dip of GMR signal will split into more resonance dips with the addition of basic constituent unit. The resonance dips are found to be deeper and deeper to enhance the resonance with the addition of period of 1DPC. Of particular interest is that the enhanced GMR signal can produce a contribution to improve the sensitivity of the biosensor. Therefore, the ultrasensitive GMR biosensor with few-layer BP-based 1DPC is designed to get a high sensitivity (Smax = 20683 RIU−1). For a comparison to the conventional surface plasmon resonance (SPR) sensor (Smax = 59 RIU−1), the sensitivity of the proposed GMR sensor has been enhanced 350 times. The BP-based 1DPC configuration, which could be developed as a promising replacement of metallic thin film, has enriched the application of GMR phenomenon in the biosensing technologies.

中文翻译：

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具有少层黑磷的超灵敏多导模生物传感器

利用基于少层黑磷 (BP) 的一维光子晶体 (1DPC)，提出了一种基于导模共振 (GMR) 的新型光学生物传感器，以提高灵敏度。由于GMR与自身的强耦合，随着基本组成单元的加入，GMR信号的共振谷将分裂成更多的共振谷。发现共振下降越来越深，以随着 1DPC 周期的增加而增强共振。特别令人感兴趣的是，增强的 GMR 信号有助于提高生物传感器的灵敏度。因此，具有基于 BP 的少层 1DPC 的超灵敏 GMR 生物传感器旨在获得高灵敏度（Smax = 20683 RIU-1）。为了与传统的表面等离子体共振 (SPR) 传感器 (Smax = 59 RIU-1) 进行比较，提议的 GMR 传感器的灵敏度提高了 350 倍。基于 BP 的 1DPC 配置可以作为金属薄膜的有前途的替代品而开发，丰富了 GMR 现象在生物传感技术中的应用。