标题： 表面等离子体极化激元从“点”源的干扰 显示英文标题

标题： Interference of surface plasmon polaritons from a "point" source

摘要： 表面等离子体极化激元（SPPs）在金属表面上从“点”源产生的干涉图案被观察到。 这些干涉图案来自于向前传播的SPPs以及从障碍物（如直边、角落和环形沟槽结构）反射的SPPs。 创新性地，使用近场激发方法在Au/空气界面自由选择的位置生成了一个直径为100 nm的“点”SPPs源。 这种“点”源提供了足够好的相干性以产生明显的干涉现象。 SPPs的建设性和破坏性干涉图案与数值计算结果高度一致。 由于高相干性、确定的位置和对初始光源的最低要求，这种“点”SPPs源可能在等离激元学的研究中具有应用价值。 显示英文摘要

摘要： The interference patterns of the surface plasmon polaritons(SPPs) on the metal surface from a "point" source are observed. These interference patterns come from the forward SPPs and the reflected one from the obstacles, such as straightedge,corner, and ring groove structure. Innovation to the previous works, a "point" SPPs source with diameter of 100 nm is generated at the freely chosen positions on Au/air interface using near field excitation method. Such a "point" source provides good enough coherence to generate obvious interference phenomenon. The constructive and destructive interference patterns of the SPPs agree well with the numerical caculation. This "point" SPPs source may be useful in the investigation of plasmonics for its high coherence, deterministic position and minimum requirement for the initial light source.