Investigation of the distinct optical property of nanoporous gold

This is the authors' abstract. We don't add key points for this paper.

Nanoporous gold (NPG) is promising for optical applications because of their distinct properties. NPG film presents different optical features by showing two transmission peaks in the visible instead of one peak of the solid gold film. This phenomenon has been interpreted differently and the existing theoretical results do not totally agree with the experiments. In this work, an effective model of NPG by taking advantage of the trigonometric functions are used to investigate the optical properties of NPG with the wavy ligaments. The calculated spectral characteristics agree well with the experimental results of NPG in various dielectrics. Unlike the earlier works, we attribute the spectrum features of NPG as the peak value of transmission at longer wavelength due to the diluted gold. And the dip value of the transmission spectrum near 550 nm can be certified as the result of both the larger ohmic loss and the smaller skin depth. Our model provides a simple and effective way to design the ideal optical property of NPG and its composites.