Molecular Plasmon Hybridizition in Olefin Chains

TL;DR

This paper investigates the hybridization of plasmonic excitations in olefin molecular chains using advanced computational methods, revealing mechanisms of plasmon coupling and charge effects in molecular systems.

Contribution

It introduces a combined computational approach to identify and analyze plasmon hybridization in molecular chains, advancing understanding of molecular plasmon physics.

Findings

Plasmon hybridization occurs when molecules couple, involving collective and single-particle excitations.

Charge deposition enhances plasmon modes while preserving molecular properties.

Hybridization mechanisms are similar to those in nanoparticle systems.

Abstract

With the continuous emergence of molecular and cluster devices or systems, the relationship between the plasmonic properties of multiple clusters and molecular interactions and the properties of the original single cluster or molecule becomes more and more important. Similar to plasmonic nanoparticle hybridization, there is also a hybrid phenomenon between two molecules with plasmon excitation modes. Using linear response time-dependent density functional theory (LR-TDDFT) and real-time propagation time-dependent density functional theory (RT-TDDFT) and combining the plasmonicity index (PI) and the transition contribution maps (TCM) methods we identify the plasmon excitation mode in the small molecular olefin chains with -OH and -NH2 groups and analyze the hybridization characteristics using charge transitions. The results show that for the plasmons in molecules, there are also plasmon hybridization mechanism exist when the two molecules coupling together. The TCM analysis shows that the plasmon modes and hybridization is a result of coexist of collective and single particle excitation. When there is extra charge depose in the molecules, as the electrons can moving in the whole molecules, the plasmon mode becomes stronger and the individual properties of the molecules maintains in the coupling. The study paves a way for molecule plasmon and the physics picture when the molecules are coupled together.