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Silicon-based surface plasmon resonance sensing with two surface plasmon polariton modes

机译:具有两个表面等离子体激元模式的基于硅的表面等离子体共振检测

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摘要

Surface plasmon resonance (SPR) sensing on a silicon-based platform is considered. We have studied properties of SPR in a combined silicon-dielectric layer-gold film-sample medium structure and established conditions of the simultaneous excitation of two plasmon polariton modes that provide narrow and well-separated minima of the reflected intensity. It has been shown that the external mode over the gold-sample medium interface demonstrates a highly sensitive response to a change in the refractive index of the sample medium, whereas the internal mode over the dielectric-gold interface is almost insensitive to medium parameters. We propose that the internal mode can be used as an effective reference zero point for miniature and portable SPR-based systems designed for field and multichannel sensing.
机译:考虑了基于硅的平台上的表面等离子体共振(SPR)感应。我们已经研究了组合的硅-电介质层-金膜-样品介质结构中的SPR的性质,并建立了同时激发两个等离振子极化子模式的条件,这两个极化子极化子模式提供了狭窄且分离良好的反射强度最小值。已经表明,金-样品介质界面上的外部模式对样品介质的折射率变化表现出高度敏感的响应,而介电-金界面上的内部模式对介质参数几乎不敏感。我们建议内部模式可以用作为现场和多通道传感设计的基于微型和便携式SPR的系统的有效参考零点。

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