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arXiv · 2002.09337

Refractive index mediated plasmon hybridization in an array of aluminium nanoparticles

Alina Muravitskaya·Anisha Gokarna·Artur Movsesyan·Sergei Kostcheev·Anna Rumyantseva·Christophe Couteau·Gilles Lerondel·Anne-Laure Baudrion·Sergey Gaponenko·Pierre Michel Adam
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Abstract

The arrangement of plasmonic nanoparticles in a non-symmetrical environment can feature the far-field and/or near-field interactions depending on the distance between the objects. In this work, we study the hybridization of three intrinsic plasmonic modes (dipolar, quadrupolar and hexapolar modes) sustained by one elliptical aluminium nanocylinder, as well as behavior of the hybridized modes when the nanoparticles are organized in array or when the refractive index of the surrounding medium is changed. The position and the intensity of these hybridized modes were shown to be affected by the near-field and far-field interactions between the nanoparticles. In this work, two hybridized modes were tuned in the UV spectral range to spectrally coincide with the intrinsic interband excitation and emission bands of ZnO nanocrystals. The refractive index of the ZnO nanocrystals layer influences the positions of the plasmonic modes and increases the role of the superstrate medium, which in turn results in the appearance of two separate modes in the small spectral region. Hence, the enhancement of ZnO nanocrystals photoluminescence benefits from the simultaneous excitation and emission enhancements.

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Alina Muravitskaya, Anisha Gokarna, Artur Movsesyan, Sergei Kostcheev, Anna Rumyantseva, Christophe Couteau, Gilles Lerondel, Anne-Laure Baudrion, Sergey Gaponenko, Pierre Michel Adam. 2020-02-21. Refractive index mediated plasmon hybridization in an array of aluminium nanoparticles. https://doi.org/10.1039/c9nr09393a

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