Yu Zongfu, Fan Shanhui
Ginzton Lab, Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA.
Opt Express. 2011 May 23;19(11):10029-40. doi: 10.1364/OE.19.010029.
The extraordinary spectral sensitivity of surface plasmon resonance (SPR) sensors is commonly attributed to the modal overlap or unique dispersion of surface plasmons. In contrast to this belief, we show that such high sensitivity is due to the multi-mode nature of the sensing scheme. This concept of multi-mode sensing can be applied to dielectric systems as well in order to achieve similar extraordinary spectral sensitivity. We also show that there is a fundamental constraint between the spectral sensitivity and quality factor in such multi-mode sensing approach.
表面等离子体共振（SPR）传感器非凡的光谱灵敏度通常归因于表面等离子体的模式重叠或独特色散。与这种观点相反，我们表明这种高灵敏度是由于传感方案的多模性质。这种多模传感概念也可以应用于介电系统，以实现类似的非凡光谱灵敏度。我们还表明，在这种多模传感方法中，光谱灵敏度和品质因数之间存在基本限制。
