Theoretical and experimental perspectives on localized plasmons in gold nanospheroids

Abstract

Theoretical frameworks play a pivotal role in comprehending the optical characteristics of gold nanorods, providing valuable perspectives on the factors that impact their optical properties. These frameworks play a key role in anticipating how nanorods will perform under different circumstances and in validating experimental findings against theoretical projections. Through the utilization of theoretical frameworks, scientists can efficiently delve into creative nanostructure designs, ultimately enriching our understanding of how gold nanorods react optically for both academic research and practical implementations. The optical behavior of elongated gold spheroids was extensively analyzed using both the quasi-static approximation (QSA) and the Modified Long Wavelength Approximation (MLWA) to gauge their effectiveness in projecting experimental results. While the QSA proves beneficial in specific scenarios, its accuracy tends to be overshadowed by empirical data obtained from UV–visible spectroscopy and helium ion microscopy (HIM). In contrast, the MLWA exhibits a stronger alignment with empirical findings, thus providing a more accurate theoretical groundwork. This alignment implies that the MLWA considers intricacies and variables overlooked by the QSA, establishing it as a more dependable approach for envisaging the optical conduct of such nanostructures. The juxtaposition emphasizes the significance of selecting appropriate theoretical frameworks in the realm of nanoscale optics, with the MLWA emerging as the preferred option for investigations concerning elongated gold spheroids.