Nanoparticles (NPs) with metal@dielectric core@shell, nano-sized dimensions, and local surface plasmon resonance peaks (LSPR) have to play a vital role owing to their optical interaction and comprehensive array of applications in several fields, including information transmission, biomedicine, and other advanced technologies. This work examines the optical characteristics of core/shell nanoparticle structures that can be regulated via aggregation. These structures have Au nanoparticles (NP) measuring 16.6 nm in diameter, while the shell thickness ranges from \(24.6 \pm 3.6\) to \(9.0 \pm 1.7\) nm. The absorption spectra of the Au core-Cu2O shell nanoparticles were analyzed using the boundary element method (BEM). The absorption cross-sections over various wavelengths of light were determined by solving the Maxwell equations. Both Ox- and Oz-axis polarizations of an incident plane wave are used to determine the core-shell Au@Cu2O nanoparticles’ field enhancement. Factors such as the core-shell ratio, the particle’s morphologies, and the spacing between the particles are taken into consideration to evaluate how particle structures influence their optical properties. The particle system’s distribution and organization were also considered, along with an analysis of the impact of the particle arrangement and distribution within the particle system. The similarity between the calculation and experimental results underscores the accuracy of our simulation model.
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