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Attenuation of SPPs along the propagation direction. (a, b) PL images for the interference fringes along the x-direction on a Au stripe with the incident angle of (a) 70° and (b) 60°, respectively. (c, d) Simulated patterns corresponding to the interference fringes shown in (a) and (b), respectively. (e, f) Experimentally measured (black) and simulated (red) intensity dispersion for the interference fringes show in (a, c) and (b, d), respectively. λ0 = 980 nm. Scale bar: (a–d) 50 μm.
