title: Tailoring Plasmon Coupling in Self-Assembled One-Dimensional Au Nanoparticle Chains through Simultaneous Control of Size and Gap Separation.
abstract: We investigated the near- and far-field response of one-dimensional chains of Au nanoparticles (NPs) fabricated with high structural control through template guided self-assembly. We demonstrate that the density of polyethylene glycol (PEG) ligands grafted onto the NP surface, in combination with the buffer conditions, facilitate a systematic variation of the average gap width (g) at short separations ofg<1.1nm. The overall size (n) of the cluster was controlled through the template. The ability to independently varynandgallowed for a rational tuning of the spectral response in individual NP clusters over a broad spectral range. We used this structural control for a systematic investigation of the electromagnetic coupling underlying the superradiant cluster mode. Independent of the chain length, plasmon coupling is dominated by direct neighbor interactions. A decrease in coupling strength at separations ≲0.5nm indicates the presence of non-local and/or quantum mechanical coupling mechanisms.
authors.affiliation: Department of Chemistry and the Photonics Center, Boston University, Boston, MA 02215, United States.
authors.forename: Tianhong
authors.initials: T
authors.lastname: Chen
authors.forename: Mahshid
authors.initials: M
authors.lastname: Pourmand
authors.forename: Amin
authors.initials: A
authors.lastname: Feizpour
authors.forename: Bradford
authors.initials: B
authors.lastname: Cushman
authors.forename: Björn M
authors.initials: BM
authors.lastname: Reinhard
keywords: Metamaterials; Nanofabrication; Plasmonic Molecules; Quantum Plasmonics; Self-Assembly
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