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A robust and reproducible preparation of self-standing nanoporous gold leaves(NPGL) is presented, with optical characterization and plasmonic behaviouranalysis. Nanoporous gold (NPG) layers are tipically prepared as thin films ona bulk substrate. Here we present an alternative approach consisting in thepreparation of NPGL in the form of a self-standing film. This solution leads toa perfectly symmetric configuration where the metal is immersed in ahomogeneous medium and in addition can support the propagation of symmetric andantisymmetric plasmonic modes. With respect to bulk gold, NPG shows metallicbehaviour at higher wavelengths, suggesting possible plasmonic applications inthe near / medium infrared range. In this work the plasmonic properties in thewide wavelength range from the ultraviolet up to the mid-infrared range havebeen investigated.

Nanoporous gold leaves: plasmonic behavior in the visible and mid-infrared spectral regions