Exciton鈥揚lasmon Coupling Enhancement via Metal Oxidation

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• 作者：Francesco Todisco ; Stefania D鈥橝gostino ; Marco Esposito ; Antonio I. Fern谩ndez-Dom铆nguez ; Milena De Giorgi ; Dario Ballarini ; Lorenzo Dominici ; Iolena Tarantini ; Massimo Cuscun谩 ; Fabio Della Sala ; Giuseppe Gigli ; Daniele Sanvitto
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：October 27, 2015
• 年：2015
• 卷：9
• 期：10
• 页码：9691-9699
• 全文大小：610K
• ISSN：1936-086X

文摘

In this paper, we report on the effect of metal oxidation on strong coupling interactions between silver nanostructures and a J-aggregated cyanine dye. We show that metal oxidation can sensibly affect the plexcitonic system, inducing a change in the coupling strength. In particular, we demonstrate that the presence of oxide prevents the appearance of Rabi splitting in the extinction spectra for thick spacers. In contrast, below a threshold percentage, the oxide layer results in an higher coupling strength between the plasmon and the Frenkel exciton. Contrary to common belief, a thin oxide layer seems thus to act, under certain conditions, as a coupling mediator between an emitter and a localized surface plasmon excited in a metallic nanostructure. This suggests that metal oxidation can be exploited as a means to enhance light鈥搈atter interactions in strong coupling applications.