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表面等离体子波(SPW)可与入射光横磁波极化能量耦合并被共振激发,这种现象被称为表面等离体子共振现象(SPR)。主要利用扫描近场光学显微镜(SNOM)技术和表面等离体子共振现象技术相结合,来研究金膜表面等离体子共振。设计并建立了结构独特的新型Kretschmann型表面等离体子共振现象耦合装置,同时又设计了具有厚度梯度的表面等离体子的制备方法。在此基础上,测量了改变入射角条件下的表面等离体子共振曲线,测得该装置的等离体子共振角灵敏度为1°。并且对金膜表面进行表面等离体子共振条件下的扫描近场光学显微成像。实验结果表明,在共振时金膜表面的扫描成像比不共振时清晰,而且增加了很多细节。应用表面等离体子共振现象技术将可以明显提高扫描近场光学显微镜的信噪比、分辨力等性能。
Surface plasmon wave (SPW) can be coupled with the transverse magnetic wave polarization energy of the incident light and excited by resonance. This phenomenon is called surface plasmon resonance (SPR) phenomenon. The main application of scanning near-field optical microscopy (SNOM) technology and surface plasmon resonance phenomenon technology to study gold surface plasmon resonance. A novel Kretschmann-type surface plasmon resonance coupling device was designed and established. At the same time, a method of preparing surface plasmon with thickness gradient was designed. On this basis, the surface plasmon resonance curve under the condition of changing the incident angle was measured, and the sensitivity of the plasma resonance angle of the device was measured to be 1 °. The near-field optical microscopy imaging of the gold film surface under surface plasmon resonance conditions was performed. The experimental results show that the scanning imaging of the gold film surface at resonance is clearer than without resonance and adds a lot of detail. Application of surface plasmon resonance phenomenon will be able to significantly improve the scanning near-field optical microscope signal to noise ratio, resolution and other properties.