Open Access Nano Express

Strong plasmon-exciton coupling in a hybrid system of gold nanostars and J-aggregates

Dzmitry Melnikau1, Diana Savateeva2, Andrey Susha3, Andrey L Rogach3 and Yury P Rakovich24*

Author affiliations

1 CIC nanoGune Consolider, Tolosa Hiribidea 76, Donostia-San Sebastian 20018, Spain

2 Centro de Física de Materiales (MPC, CSIC-UPV/EHU), Donostia International Physics Center (DIPC), Po Manuel de Lardizabal 5, Donostia-San Sebastian 20018, Spain

3 Centre for Functional Photonics (CFP), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, SAR, People's Republic of China

4 IKERBASQUE, Basque Foundation for Science, Bilbao 48011, Spain

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Citation and License

Nanoscale Research Letters 2013, 8:134  doi:10.1186/1556-276X-8-134

Published: 22 March 2013

Abstract

Hybrid materials formed by plasmonic nanostructures and J-aggregates provide a unique combination of highly localized and enhanced electromagnetic field in metal constituent with large oscillator strength and extremely narrow exciton band of the organic component. The coherent coupling of localized plasmons of the multispiked gold nanoparticles (nanostars) and excitons of JC1 dye J-aggregates results in a Rabi splitting reaching 260 meV. Importantly, broad absorption features of nanostars extending over a visible and near-infrared spectral range allowed us to demonstrate double Rabi splitting resulting from the simultaneous coherent coupling between plasmons of the nanostars and excitons of J-aggregates of two different cyanine dyes.

Keywords:
Gold; Nanostars; Organic compounds; Plasmons; Rabi splitting; Fano effect