Tailoring Plasmon Coupling in Self-Assembled One-Dimensional Au Nanoparticle Chains through Simultaneous Control of Size and Gap Separation

• Published in: The journal of physical chemistry letters 2013-07, Vol.4 (13), p.2147-2152
• Main Authors: Chen, Tianhong, Pourmand, Mahshid, Feizpour, Amin, Cushman, Bradford, Reinhard, Björn M
• Format: Article
• Language: English
• Subjects: Plasmonics, Optical Materials, and Hard Matter
• ISSN: 1948-7185; 1948-7185
• DOI: 10.1021/jz401066g

We investigated the near- and far-field response of 1D chains of Au nanoparticles (NPs) fabricated with high structural control through template guided self-assembly. We demonstrate that the density of poly(ethylene glycol) 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 of g < 1.1 nm. The overall size (n) of the individual clusters was controlled through the template. The ability to independently vary n and g allowed 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 ≲0.5 nm indicates the presence of nonlocal or quantum-mechanical coupling mechanisms.