Surface-plasmon resonance spectrometry and characterization of absorbing liquids
Surface-plasmon resonance spectrometry and characterization of absorbing liquids
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DOI：
10.1364/ao.39.003314
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发表时间：
2000-07-01
期刊：
影响因子：
1.9
通讯作者：
Schuessler, HA
中科院分区：
文献类型：
--
作者：
Kolomenskii, AA;Gershon, PD;Schuessler, HA
通过近似解析模型和精确数值模型分析了样品介质的吸收对表面等离子体共振（SPR）特性的影响。我们表明，吸收导致特定的SPR角附近的反射率值的变化，这些可以用于吸光度检测。最强的吸收引起的反射率的变化发生在两个值的金属膜厚度（28和55 nm的金膜和λ = 632.8 nm）。使用罗丹明700在乙醇中的样品溶液，我们测量了SPR角和反射率在包含610-680 nm处的强吸收带的波长间隔上的特征变化。的折射率和吸收从SPR测量的同时测定的可能性被证明，并具有潜在的物质特异性检测。(C)2000年美国光学学会OCIS代码：240.6680、260.5470、260.6970、170.0170。
The effect of absorption of the sample medium on the surface-plasmon resonance (SPR) characteristics is analyzed by approximate analytical and exact numerical models. We show that absorption leads to specific changes in the value of reflectivity near the SPR angle and that these can be used for absorbance detection. The strongest absorption-induced change in reflectivity occurs at two values of metal film thickness (28 and 55 nm for a gold film and lambda = 632.8 nm). Using a sample solution of Rhodamine 700 in ethanol, we measured the characteristic changes in the SPR angle and in reflectivity over the wavelength interval encompassing the strong absorption band at 610-680 nm. The possibility of the simultaneous determination of the refractive index and absorption from SPR measurements is demonstrated and has the potential for substance-specific detection. (C) 2000 Optical Society of America OCIS codes: 240.6680, 260.5470, 260.6970, 170.0170.