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搭建采用光纤锥近场激发银纳米线表面等离子体激元的光路,并在氧化铟锡(ITO)衬底上实现银纳米线表面等离子体激元突破衍射极限在亚波长领域的光波导。通过R轴旋转平移台,改变光纤锥与银纳米线平行方向上的角度,研究在ITO衬底上银纳米线表面等离子体激元在不同激发角度下的耦合效率。实验上获得不同角度下银纳米线光波导的电荷耦合元件(CCD)数码信息图,并采用Adobe Photoshop灰度直方图的方法,在100 pixel×100 pixel质量下计算入射光强以及出射光强,进而计算银纳米线的耦合效率。结果表明,在不同的激发角度下,银纳米线在ITO衬底上的耦合效率与激发角度相关,两者平行时耦合效率最高,垂直时耦合效率最低。
The optical path of the silver nanowire surface plasmon polariton excited by the fiber cone was set up and the optical waveguide with silver nanowire surface plasmon polaritons breaking the diffraction limit in the subwavelength region was realized on indium tin oxide (ITO) substrate. Through the R-axis translation stage, the angle between the fiber cone and the silver nanowire was changed, and the coupling efficiency of the surface plasmon polaritons on the silver nanowire under different excitation angles was investigated. The charge coupled device (CCD) digital information of the silver nanowire optical waveguide was obtained experimentally from different perspectives. The intensity of incident light and the intensity of incident light were calculated under the quality of 100 pixel × 100 pixel using the method of Adobe Photoshop grayscale histogram. Then calculate the coupling efficiency of silver nanowires. The results show that the coupling efficiency of Ag nanowires on the ITO substrate is related to the excitation angle under different excitation angles, and the coupling efficiency is the highest when the two are parallel and the coupling efficiency is the lowest at the vertical.