Effects of sample thickness on the optical properties of surface plasmon-coupled emission
Effects of sample thickness on the optical properties of surface plasmon-coupled emission
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DOI：
10.1021/jp0312619
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发表时间：
2004-08-12
影响因子：
3.3
通讯作者：
Lakowicz, JR
中科院分区：
文献类型：
--
作者：
Gryczynski, I;Malicka, J;Lakowicz, JR
在最近的报道中，我们展示了激发荧光团与薄银或金薄膜的耦合，导致定向表面等离子体耦合发射（SPCE）穿过银薄膜并进入玻璃衬底。在本报告中，我们描述了不同厚度的聚乙烯醇（PVA）膜在50 nm银膜上的SPCE的光谱和空间特性。PVA厚度在30 ~ 750nm之间变化。在厚度小于160 nm的PVA薄膜中，SPCE在玻璃基板上以单角度发生，且仅显示p偏振。当PVA厚度增加到300 nm时，我们在两个角度观察SPCE，每个角度的s或p极化不同。对于500 ~ 750nm厚的PVA薄膜，我们在三个或四个角度观察到SPCE， s和p极化交替。SPCE的多环和不寻常的s偏振发射与银- pva复合膜中预期的波导模式一致。然而，与我们的预期相反，SPCE的平均寿命与PVA膜没有实质性的变化。多角度、不同极化条件下对SPCE的观测为SPCE在各向异性系统的研究或独特传感器件的开发提供了新的机会。
In recent reports, we demonstrated coupling of excited fluorophores with thin silver or gold films resulting in directional surface plasmon-coupled emission (SPCE) through the silver film and into the glass substrate. In the present report, we describe the spectral and spatial properties of SPCE from sulforhomamine 101 in polyvinyl alcohol (PVA) films of various thicknesses on 50-nm silver films. The PVA thickness varied from about 30 to 750 nm. In thin PVA films with a thickness less than 160 nm, SPCE occurred at a single angle in the glass substrate and displayed only p polarization. As the PVA thickness increased to 300 nm, we observed SPCE at two angles, with different s or p polarization for each angle. For PVA films from 500 to 750 nm thick, we observed SPCE at three or four angles, with alternating s and p polarizations. The multiple rings of SPCE and the unusual s-polarized emission are consistent with the expected waveguide modes in the silver-PVA composite film. However, in contrast to our expectations, the average lifetimes of SPCE were not substantially changed from the PVA films. The observation of SPCE at multiple angles and with different polarization opens new opportunities for the use of SPCE to study anisotropic systems or to develop unique sensing devices.