(a) Scanning electron microscope image of a Ag NP attached on almost the middle of a Ag NW. The inset shows the shape of the Ag NP. The excited light is incident on the Ag NP. (b)–(g) Optical micrographs of the scattering light at the two ends of the NW under different polarized conditions. The polarized angles (θ,ϕ) are (b) (–140°, 90°), (c) (–90°, 90°), (d) (–41°, 90°), (e) (140°, 90°), (f) (90°, 90°), (g) (41°, 90°). The arrows indicate the scattering light spots. The scale bars indicate 2 μm.