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arXiv 1201.0974physics.optics
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通过相敏测量提高基于LSPR的refractive index感测的品质因数

Boosting the Figure Of Merit of LSPR-based refractive index sensing by phase-sensitive measurements

Kristof Lodewijks, Wim Van Roy, Gustaaf Borghs, Liesbet Lagae, Pol Van Dorpe

摘要:

局域表面等离子体共振具有非常有趣的特性,用于各种各样的传感应用。在许多现有的应用中,仅考虑反射或透射信号的强度,而忽略相位信息。在(局部)表面等离子体共振的中心频率处,电子云相对于入射波在同相振荡和异相振荡之间进行过渡。在这里,我们表明,这些信息可以通过实验提取执行相敏测量,这导致线宽几乎是一个数量级小于那些基于强度的测量。由于这种相变是等离子体共振的固有性质,因此这为通过考虑等离子体共振的相位来提高折射率感测的品质因数(FOM)开辟了许多可能性。我们实验研究了这两个模型系统:随机分布的金纳米盘和金纳米环上的连续金层和介电间隔,并观察到FOM值高达8.3和16.5的相应的纳米粒子。

英文摘要:

Localized surface plasmon resonances possess very interesting properties for a wide variety of sensing applications. In many of the existing applications only the intensity of the reflected or transmitted signals is taken into account, while the phase information is ignored. At the center frequency of a (localized) surface plasmon resonance, the electron cloud makes the transition between in- and out-of-phase oscillation with respect to the incident wave. Here we show that this information can experimentally be extracted by performing phase-sensitive measurements, which result in linewidths that are almost one order of magnitude smaller than those for intensity based measurements. As this phase transition is an intrinsic property of a plasmon resonance, this opens up many possibilities for boosting the figure of merit (FOM) of refractive index sensing by taking into account the phase of the plasmon resonance. We experimentally investigated this for two model systems: randomly distributed gold nanodisks and gold nanorings on top of a continuous gold layer and a dielectric spacer and observed FOM values up to 8.3 and 16.5 for the respective nanoparticles.

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