Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic, Chaberská 57, Prague, Czech Republic.
Biointerphases. 2008 Sep;3(3):FD4-11. doi: 10.1116/1.2994687.
Surface plasmon resonance (SPR) sensors use two types of surface plasmons: (i) propagating along a metal-dielectric interface and (ii) localized on metallic nano-objects. This article presents theoretical analysis of sensitivity of SPR sensors based on spectroscopy of localized surface plasmons on metallic nanoparticles. Analytical formulas inter-relating bulk and surface refractive index sensitivity with main design parameters are derived using the electrostatic approximation. The effect of particle diameter is accounted for by means of Mie theory. Figures of merit for SPR sensors using localized and propagating surface plasmons are calculated and compared. Although sensors based on spectroscopy of localized surface plasmons on gold spherical particles show promise for detection of processes occurring in the close proximity of the particle surface, their performance is still inferior to that of SPR sensors based on spectroscopy of propagating surface plasmons.
表面等离子体共振（SPR）传感器使用两种类型的表面等离子体：（i）沿金属-电介质界面传播，（ii）局域在金属纳米物体上。本文基于金属纳米粒子局域表面等离子体的光谱学，对 SPR 传感器的灵敏度进行了理论分析。使用静电近似法推导出了将体折射率灵敏度和表面折射率灵敏度与主要设计参数相关联的解析公式。通过米氏理论考虑了粒子直径的影响。计算并比较了基于局域表面等离子体和传播表面等离子体光谱的 SPR 传感器的性能指标。尽管基于金球形粒子局域表面等离子体光谱的传感器在检测靠近粒子表面发生的过程方面具有潜力，但它们的性能仍不如基于传播表面等离子体光谱的 SPR 传感器。
