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Optical analysis of the AgAuPdPt and AuPdPt alloy nanostructures fabricated with the Ag40nm/Au15nm/Pd15nm/Pt15nm quad-layers. (a–a-3) Extinction and normalized extinction spectra. (b–b-3) Reflectance and normalized reflectance spectra. (c) Transmittance spectra. (d) AFM image of the typical AuPdPt NP. (e, f) Corresponding e-field distribution and vector plot of NP.
