Distance dependence of fluorescence enhancement from photonic crystal surfaces
Distance dependence of fluorescence enhancement from photonic crystal surfaces
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DOI：
10.1063/1.2906175
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发表时间：
2008-04-15
影响因子：
3.2
通讯作者：
Cunningham, Brian T.
中科院分区：
文献类型：
--
作者：
Ganesh, Nikhil;Mathias, Patrick C.;Cunningham, Brian T.
我们通过实验验证了大面积平面光子晶体谐振器提供的荧光增强的近场性质。这是通过将荧光团的荧光增强因子绘制为其在装置表面上方的距离的函数并将结果与数值计算进行比较来完成的。实验表明，增强因子的衰减是与器件表面距离的指数函数，并且与数值计算的指数衰减长度非常吻合。与涉及金属表面表面等离子体激元的方法相比，我们发现当荧光团最接近光子晶体表面时，由于在短距离内不存在猝灭，因此获得最大增强。我们还表明，衰减长度很大程度上受器件中谐振光的波长控制。 (C) 2008 年美国物理研究所。
We experimentally verify the near-field nature of the fluorescence enhancement afforded by large area planar photonic crystal resonators. This is done by mapping the fluorescence enhancement factor for a fluorophore as a function of its distance above the device surface and comparing the results to numerical calculations. Experiments show that the decay of the enhancement factor is exponential as a function of distance from the device surface, and excellent agreement with the numerically calculated exponential decay length is obtained. In contrast to approaches involving surface plasmons on metal surfaces, we find that the maximum enhancement is obtained when the fluorophore is closest to the photonic crystal surface due to the absence of quenching at short distances. We also show that the decay length is largely controlled by the wavelength of light resonant in the device. (C) 2008 American Institute of Physics.