Terahertz biosensing provides a suitable method to identify biomolecules due to their rich spectral fingerprint in this electromagnetic region. However, owing to the limitations of terahertz sources and detectors, the signal is weak and requires to be enhanced by particular technologies. In this paper, we propose a terahertz plasmonic biosensor based on Goos-Hänchen effect in graphene. Sample sensing can be realized by measuring the Goos-Hänchen shift of the reflected light. Numerical simulations show that the sensitivity of this biosensor can reach a high value up to $2.5\times 10^4\mu$m/RIU. This graphene plasmonic configuration combined with Goos-Hänchen effect provides a novel high-sensitivity approach for future terahertz biosensing applications.

中文翻译：

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基于石墨烯中 Goos-Hänchen 效应的高灵敏度太赫兹生物传感器

太赫兹生物传感提供了一种合适的方法来识别生物分子，因为它们在这个电磁区域中具有丰富的光谱指纹。然而，由于太赫兹源和探测器的限制，信号较弱，需要通过特定技术进行增强。在本文中，我们提出了一种基于石墨烯中的 Goos-Hänchen 效应的太赫兹等离子体生物传感器。可以通过测量反射光的 Goos-Hänchen 位移来实现样品传感。数值模拟表明，该生物传感器的灵敏度可以达到高达 $2.5\times 10^4\mu$m/RIU 的高值。这种石墨烯等离子体配置与 Goos-Hänchen 效应相结合，为未来的太赫兹生物传感应用提供了一种新的高灵敏度方法。