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. Author manuscript; available in PMC: 2019 Jan 2.
Published in final edited form as: Anal Chem. 2017 Nov 7;90(1):19–39. doi: 10.1021/acs.analchem.7b04251

Figure 4.

Figure 4

Surface plasmon polariton excitation in noble metal alloys. Measurements and calculations showing surface plasmon polariton excitation as a function of internal angle in a Kretschmann configuration for (a, b) Ag–Au, (c, d) Au–Cu, and (e, f) Cu–Ag thin films. Light source: 637 nm diode laser p-polarized with 3.6 mW. Reprinted from Gong, C.; Leite, M. S. ACS Photonics 2016, 3, 507–513 (ref 96). Copyright 2016 American Chemical Society.