Effect of Composition, Dimension and Shape on the Optical Properties of Gold Nanoparticles—A Theoretical Analysis
Abstract:Gold nanoparticles have great potential towards optical investigations in biological tissues which include imaging applications as well as therapeutic applications. However, the effectiveness of these techniques is greatly governed by the optical properties of the nanoparticles which are determined by its shape, size and composition and a variety of computational methods can be adopted to determine their optical efficiencies. A systematic study based on the finite-difference time-domain (FDTD) method was carried out to determine the trends in the optical properties of gold nanoparticles of varying sizes, shapes and compositions over a wavelength range of 380 nm–1064 nm. The finite difference time domain method based computational models were developed towards this direction and the results are in good agreement with the reported works leading to further investigations which provide details to the optical response of various forms of gold nanoparticles. Gold nanorods with a fixed aspect ratio exhibits dominant absorption efficiency at smaller sizes. The larger nanoparticles exhibited dominant scattering efficiencies making more favorable for scattering based imaging applications. From the computational investigations, gold nanorods are found to offer the best tunability properties, optical efficiencies and sensitivity compared to other forms for various biomedical applications.
Document Type: Research Article
Publication date: 2011-12-01
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