Nonlocal optical response in metallic nanostructures

TL;DR

This review discusses the theoretical models and effects of nonlocal optical response in metallic nanostructures, highlighting recent models like GNOR and their implications for plasmonic behavior.

Contribution

It provides a comprehensive overview of nonlocal response models, including the hydrodynamic and GNOR models, and explores their impact on plasmonic excitations in various geometries.

Findings

Nonlocal response significantly alters plasmonic resonances.

The GNOR model introduces new effects not captured by traditional models.

Future experimental setups are proposed to observe nonlocal effects.

Abstract

This review provides a broad overview of the studies and effects of nonlocal response in metallic nanostructures. In particular, we thoroughly present the nonlocal hydrodynamic model and the recently introduced generalized nonlocal optical response (GNOR) model. The influence of nonlocal response on plasmonic excitations is studied in key metallic geometries, such as spheres and dimers, and we derive new consequences due to the GNOR model. Finally, we propose several trajectories for future work on nonlocal response, including experimental setups that may unveil further effects of nonlocal response.