Van der Waal’s heterostructure assembling low dimensional materials are the new paradigm in the field of nanophotonics. In this work, we theoretically investigate Van der Waal’s optical metasurfaces consisting of graphene and hBN for the application of biosensing of multiple analytes in the mid-infrared (MIR) region. Phonon polaritons of hexagonal boron nitride (hBN) show an advantage over plasmon polaritons, as the phonon polaritons are lossless and possess high momentum and enhanced lifetime. The hybrid phonon mode produced at 6.78 µm in the mid-infrared (MIR) region with near-perfect absorption is used for surface-enhanced infrared absorption (SEIRA) based detection of organic analytes. Moreover, by adding the graphene layer, the device’s overall resonance responses can be tuned, enabling it to identify multiple organic analytes-such as 4,4’-bis(N-carbazolyl)−1,1’-biphenyl (CBP) and nitrobenzene (Nb) [C₆H₅NO₂], just by changing graphene’s fermi potential (E_f). Owing to large wave vector of phonon polariton, the device has the capability to detect small amount of number of molecules (390 for CBP and 1990 for nitrobenzene), thus creating a highly sensitive optical biosensor.

中文翻译：

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用于多种分析物生物传感的可调谐范德华光学超表面 (VOM)

范德华的异质结构组装低维材料是纳米光子学领域的新范例。在这项工作中，我们从理论上研究了由石墨烯和 hBN 组成的范德华光学超表面，用于在中红外 (MIR) 区域对多种分析物进行生物传感。六方氮化硼（hBN）的声子极化子显示出优于等离子体极化子的优势，因为声子极化子是无损的并且具有高动量和延长的寿命。在中红外 (MIR) 区域产生的 6.78 µm 混合声子模式具有近乎完美的吸收，用于基于表面增强红外吸收 (SEIRA) 的有机分析物检测。此外，通过添加石墨烯层，可以调整设备的整体共振响应，使其能够识别多种有机分析物，例如 4、C ₆ H ₅ NO ₂ ]，只需改变石墨烯的费米势（E _f）。由于声子极化子的大波矢量，该装置能够检测少量分子（CBP 为 390，硝基苯为 1990），从而创建了一种高灵敏度的光学生物传感器。