Polarisation-independent enhanced scattering by tailoring asymmetric plasmonic systems

Gabriel Geraci, Ben Hopkins, Andrey E. Miroshnichenko, Biniyam Erkihun, Dragomir N. Neshev, Yuri S. Kivshar, Stefan A. Maier, Mohsen Rahmani

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)

Abstract

Polarised light provides an efficient way for dynamic control over local optical properties of nanoscale plasmonic structures. Yet many applications that utilise control over the plasmonic near-field would benefit if the plasmonic device maintained the same magnitude of optical response for all polarisations. Here we show that completely asymmetric nanostructures can be designed to exhibit a broadband polarisation-independent and enhanced optical response. We provide both analytical and experimental results on two sets of plasmonic trimer nanostructures consisting of unequal nanodisks/apertures with different gap spacing. We show that, at certain inter-particle separations, enhanced far-field cross sections are independent to the incident polarisation, while still demonstrating nontrivial near-field control.

Original languageEnglish
Pages (from-to)6021-6027
Number of pages7
JournalNanoscale
Volume8
Issue number11
DOIs
Publication statusPublished - 21 Mar 2016
Externally publishedYes

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