Strong coupling between localized and propagating plasmon polaritons

Date
2015
Authors
Balci, S.
Karademir, E.
Kocabas, C.
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Source Title
Optics Letters
Print ISSN
0146-9592
Electronic ISSN
Publisher
OSA - The Optical Society
Volume
40
Issue
13
Pages
3177 - 3180
Language
English
Type
Article
Journal Title
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Abstract

We investigate plasmon-plasmon (PP) coupling in the strongly interacting regimes by using a tunable plasmonic platform consisting of triangular Ag nanoprisms placed nanometers away from Ag thin films. The nanoprisms are colloidally synthesized using a seed-mediated growth method and having size-tunable localized surface plasmon polariton (SPP) resonances immobilized on Si3N4 films. The PP coupling between the localized SPPs of metal nanoprisms and the propagating SPPs of the metal film is controlled by the nanoprism concentration and the plasmon damping in the metal film. Results reveal that Rabi splitting energy determining the strength of the coupling can reach up to several hundreds meV, thus demonstrating the ultrastrong coupling occurring between localized and propagating SPPs. The metal nanoparticle-metal thin film hybrid system over the square-centimeter areas presented here provides a unique configuration to study PP coupling all the way from the weak to ultrastrong coupling regimes in a broad range of wavelengths.

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Keywords
Electromagnetic wave polarization, Hybrid systems, Metal nanoparticles, Metallic films, Metals, Nanostructures, Phonons, Photons, Plasmons, Quantum theory, Surface plasmon resonance, Thin films, Ag nanoprisms, Ag thin films, Localized surface plasmon, Nano-particle metal, Plasmon-polaritons, Rabi splitting, Seed-mediated growth methods, Strong coupling, Silver
Citation
Published Version (Please cite this version)