Abstract
A simple optical method has been designed to determine the scattering properties of non-deterministic nanoparticle array in the visible spectrum. Specifically the scattering properties of gold nanoparticles have been investigated in this paper. We have fabricated the gold nanoparticles by sputtering thin layers of gold followed by annealing. For a non-deterministic array of gold nanoparticles having diameter of 80-100 nm, the optical measurement shows that the maximum scattering occurs for a helium spectrum line of wavelength 492 nm. The experimental results agree well with the FDTD simulation results which have been carried out by importing the fabricated geometry into the simulation tool. The optical method thus provides us with simple yet novel experimental technique to directly estimate the wavelength dependent scattering properties (in the visible spectrum) of any nanoparticle array irrespective of the material, its shape, size, coverage as well as the distribution pattern. This would help us to tune the fabrication process for maximizing the scattering efficiency of any suitable nanoparticle array at a particular wavelength.
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