Multipole Excitations and Nonlocality in 1d Plasmonic Nanostructures

Area of Science:

• Nanophotonics and Plasmonics
• Computational Electromagnetics

Background:

• Efficient simulation of nonlocal effects in nanostructures is challenging.
• Multipolar expansion is crucial for understanding electromagnetic interactions in nanosystems.
• Higher-order multipoles significantly influence optical phenomena and cross-multipole coupling.

Purpose of the Study:

• To introduce a novel, accurate simulation technique for nonlocal corrections in plasmonic nanostructures.
• To investigate the role of higher-order multipoles in optical properties.
• To provide a framework for designing metamaterials with tailored optical responses.

Main Methods:

• Developed a simulation modeling technique based on the transfer-matrix method.
• Computed higher-order nonlocal corrections to effective permittivity.
• Analyzed 1D plasmonic periodic nanostructures.

Main Results:

• Successfully computed nonlocal corrections, including higher-order multipole contributions.
• Demonstrated control over nonlocal corrections by adjusting material parameters and nanolayer arrangement.
• Identified methods to maximize or minimize specific nonlocal corrections.

Conclusions:

• The developed method offers a computationally efficient and insightful approach to nonlocal effects.
• Results guide experimental design and interpretation in nanophotonics.
• Provides a pathway for designing novel metamaterials with desired optical properties.