Tuning the modal coupling in three-dimensional Au@Cu2O@Au core–shell–satellite nanostructures for enhanced plasmonic photocatalysis

O@Au core-shell-satellite hybrid structures can be tuned through rationally designing the structural features for enhancing plasmonic photocatalysis. To further comprehend the optical phenomena of different coupled nanostructures, a model was developed based on the Mie theory, which provided a different perspective to analyze coupling qualitatively in individual nanoparticles. The insights gained from this work not only shed light on the underlying mechanisms of modal coupling in individual structures but also provide an important knowledge framework that guides the rational design of coupled plasmonic nanostructures for plasmonic photochemistry and photocatalysis.