金属纳米光栅中瑞利异常的表面灵敏度
Surface sensitivity of Rayleigh anomalies in metallic nanogratings
摘要：
基于金属纳米光栅中的瑞利异常（RA）的传感方案表现出令人印象深刻的体积折射率灵敏度仅由光栅周期决定。然而，需要仔细研究表面灵敏度（这是无标记化学和生物传感的关键品质因数），以评估该技术平台的实际适用性。在本文中，我们探讨的敏感性RA在金属纳米光栅时，局部折射率的变化被认为是。我们的研究表明，与相应的体积值相比，表面灵敏度降低了两个数量级;有趣的是，这种剩余灵敏度并不归因于RA的波长偏移，RA对局部折射率变化完全不敏感，而是严格连接的等离子体效应。我们的分析增加覆盖厚度揭示了最终的表面灵敏度接近RA体值，这原来是光栅辅助表面等离子体极化激元灵敏度的上限。
英文摘要：
Sensing schemes based on Rayleigh anomalies (RAs) in metal nanogratings exhibit an impressive bulk refractive-index sensitivity determined solely by the grating period. However, the surface sensitivity (which is a key figure of merit for label-free chemical and biological sensing) needs to be carefully investigated to assess the actual applicability of this technological platform. In this paper, we explore the sensitivity of RAs in metal nanogratings when local refractive-index changes are considered. Our studies reveal that the surface sensitivity deteriorates up to two orders of magnitude by comparison with the corresponding bulk value; interestingly, this residual sensitivity is not attributable to the wavelength shift of the RAs, which are completely insensitive to local refractive-index changes, but rather to a strictly connected plasmonic effect. Our analysis for increasing overlay thickness reveals an ultimate surface sensitivity that approaches the RA bulk value, which turns out to be the upper-limit of grating-assisted surface-plasmon-polariton sensitivities.
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