Surface Plasmon Enhanced Fluorescence of Dye Molecules on Metal Grating Films
Surface Plasmon Enhanced Fluorescence of Dye Molecules on Metal Grating Films
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DOI：
10.1021/jp203530e
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发表时间：
2011-06-30
影响因子：
3.7
通讯作者：
Sun, Hong-Bo
中科院分区：
文献类型：
--
作者：
Jiang, Ying;Wang, Hai-Yu;Sun, Hong-Bo
在Ag光栅薄膜上观察到罗丹明6G（R 6G）分子的荧光增强，最大增强因子超过30倍。增强机制来自表面等离子体激元（SPP）增强吸收和表面等离子体耦合发射（SPCE）。时间分辨瞬态吸收光谱首先通过实验证实了 R 6G 的 SPP 增强吸收光谱及其对金属光栅的角度依赖性，这是传统稳态测量无法直接获得的。结合光致发光测量，我们观察了两种增强机制对荧光发射的贡献如何随激发入射角和光栅周期变化。对于较大的光栅周期，SPP增强的吸收变弱，SPCE转为荧光增强的主导机制。 SPCE 的波长分辨率能力使其可用于波长比率测量和荧光传感等潜在应用。
Fluorescence enhancement of Rhodamine 6G (R 6G) molecules with a maximal enhancement factor of more than 30-fold was observed on Ag grating films. The enhancement mechanisms arise from both the surface plasmon polariton (SPP) enhanced absorption and surface plasmon coupled emission (SPCE). Time-resolved transient absorption spectroscopy was carried out to first experimentally confirm the SPP-enhanced absorption spectra of R 6G and its angle dependence on metal gratings, which cannot be directly obtained from conventional steady-state measurements. Combined with photoluminescence measurements, we observed how the contributions from two enhancement mechanisms to fluorescence emission varied with excitation incident angle and grating period. For larger grating period, the SPP-enhanced absorption becomes weaker and SPCE turns to the dominant mechanism for fluorescence enhancement. The wavelength resolution ability of SPCE makes it useful for potential applications such as wavelength-ratiometric measurements and fluorescence sensing.