Metal nanoparticles show the phenomena of localized surface plasmon resonance (LSPR) and lead to significant optical signal enhancement in their vicinity. Here, we investigate optical-cross sections of gold nanospheres (diameter ranges from 20 nm to 100 nm) as a function of excitation wavelength, particle size, and refractive index of the surrounding medium. Scattering and absorption efficiencies are also studied to assist in choosing the optimum scattering environment for LSPR. The resonance wavelength is observed distinctly for gold nanosphere diameter greater than 30 nm and found to be varying from 502-523 nm.
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Upadhyay et al. (2024) studied this question.
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