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Enhancement of localized surface plasmon resonance detection by incorporating metal-dielectric double-layered subwavelength gratings

机译：结合金属电介质双层亚波长光栅增强局部表面等离子体共振检测

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摘要

In this study, we investigated the enhanced sensing performance of a localized surface plasmon resonance (LSPR) biosensor by employing metal-dielectric double-layered subwavelength grating structures. The numerical results showed that the LSPR substrate with a dielectric spacer can provide not only a better sensitivity but also a significantly improved reflectance characteristic. While the presence of metallic gratings leads to a broad and shallow reflectance curve inevitably, the dielectric spacer can prevent the propagating surface plasmons from being interfered by the locally enhanced fields excited at the gold gratings, finally resulting in a strong and deep absorption band at resonance. Therefore, the proposed structure could potentially open a new possibility of the enhanced LSPR detection for monitoring bio-molecular interactions of low molecular weights.
机译：在这项研究中，我们研究了采用金属介电双层亚波长光栅结构增强的局部表面等离子体共振（LSPR）生物传感器的传感性能。数值结果表明，具有介电间隔物的LSPR基板不仅可以提供更好的灵敏度，而且可以显着提高反射率特性。虽然金属光栅的存在不可避免地导致宽而浅的反射率曲线，但介电垫片可以防止传播的表面等离子体激元受到金光栅激发的局部增强场的干扰，最终在共振时产生强而深的吸收带。因此，提出的结构可能潜在地为增强的LSPR检测以监测低分子量生物分子相互作用开辟了新的可能性。

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