Abstract
Simulations of absorption spectra using Gans approximation for the prolate shape of gold nanorods are reported. Longitudinal resonance modes are observed for high aspect ratio nanorods by considering that the nanorod size in the range between 10 nm and 20 nm, where both surface scattering and dynamic depolarization are minor and hence, neglected in the present calculations. The LSPR wavelength is found to shift towards higher wavelength with increase in aspect ratio and the surrounding medium dielectric constant. A linear relationship between LSPR wavelength, aspect ratio and surrounding medium dielectric constant is obtained, which is in good agreement with the DDA results, experimental data and experimental linear fit data.
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