Fig. 3From: Au Gratings Fabricated by Interference Lithography for Experimental Study of Localized and Propagating Surface PlasmonsP-polarized extinction (αd) as a function of wavelength and angle of incidence on Au gratings with period of 296.6 ± 0.5 nm, modulation depth of 13.0 ± 3 nm (a), 20 ± 3 nm (b), 29.0 ± 3 nm (c), and 35.0 ± 3 nm (d), and after additional deposition of Au: 10 nm (e) and 20 nm (f) overlapped with the dispersion curves calculated from Eqs. 1 and 2. The dispersion curves of the surface plasmon-polaritons corresponding to the air-metal interface (1,−1) and substrate-metal interface (1s,−1s), for m = +1 (1,1s) and m = −1 (−1,−1s) diffraction orders. The color bar shows extinction with red representing high extinctionBack to article page