Plasmon–Phonon Coupling in Large-Area Graphene Dot and Antidot Arrays Fabricated by Nanosphere Lithography

Xiaolong Zhu, Weihua Wang, Wei Yan, Martin Benjamin Barbour Spanget Larsen, Peter Bøggild, Thomas Garm Pedersen, Sanshui Xiao, Jian Zi, N. Asger Mortensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Nanostructured graphene on SiO2 substrates paves the way for enhanced light–matter interactions and explorations of strong plasmon–phonon hybridization in the mid-infrared regime. Unprecedented large-area graphene nanodot and antidot optical arrays are fabricated by nanosphere lithography, with structural control down to the sub-100 nm regime. The interaction between graphene plasmon modes and the substrate phonons is experimentally demonstrated, and structural control is used to map out the hybridization of plasmons and phonons, showing coupling energies of the order 20 meV. Our findings are further supported by theoretical calculations and numerical simulations.
Original languageEnglish
JournalNano letters
Volume14
Issue number5
Pages (from-to)2907–2913
ISSN1530-6984
DOIs
Publication statusPublished - 2014

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