用于表面增强拉曼光谱的通过方位角偏振矢量光束激发的D形光纤上的实验室。
Lab on D-shaped fiber excited via azimuthally polarized vector beam for surface-enhanced Raman spectroscopy.
作者信息
Liu Min, Zhang Wending, Meng Chao, Zhang Guanghong, Zhang Lu, Mao Dong, Mei Ting
出版信息
Opt Express. 2020 Apr 13;28(8):12071-12079. doi: 10.1364/OE.390024.
We present a method for Raman examination using a silver-nanoparticles (Ag-NPs) coated D-shaped fiber (DSF) internally excited via an in-fiber azimuthally polarized beam (APB) generated by an acoustically induced fiber grating. Simulation results show that an electric-field intensity enhancement factor can be effectively improved under APB excitation compared with the linear polarization beam (LPB) excitation, because the strong gap-mode is uniformly generated between two adjacent Ag NPs on the surface of the DSF planar side. Experimental results show that the Raman signal intensity of the methylene blue (MB) detected by DSF in the case of APB excitation is ∼4.5 times as strong as that of LPB excitation, and the Raman detection sensitivity is ∼10 M. The time stability of this method is also tested to be guaranteed.
我们提出了一种使用银纳米颗粒（Ag-NPs）包覆的D形光纤（DSF）的拉曼检测方法，该光纤通过由声致光纤光栅产生的光纤内方位角偏振光束（APB）进行内部激发。模拟结果表明，与线偏振光束（LPB）激发相比，在APB激发下电场强度增强因子可有效提高，这是因为在DSF平面侧表面上两个相邻的Ag NPs之间均匀地产生了强隙模。实验结果表明，在APB激发情况下，DSF检测到的亚甲基蓝（MB）的拉曼信号强度约为LPB激发时的4.5倍，拉曼检测灵敏度约为10 M。该方法的时间稳定性也经过测试得到了保证。
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