Zhu, Xiaolong3; Wang, Weihua5; Yan, Wei5; Larsen, Martin Benjamin Barbour Spanget3; Bøggild, Peter5; Pedersen, Thomas Garm6; Xiao, Sanshui5; Zi, Jian8; Mortensen, N. Asger5
1 Department of Photonics Engineering, Technical University of Denmark2 Structured Electromagnetic Materials, Department of Photonics Engineering, Technical University of Denmark3 Department of Micro- and Nanotechnology, Technical University of Denmark4 Nanointegration, Department of Micro- and Nanotechnology, Technical University of Denmark5 Center for Nanostructured Graphene, Center, Technical University of Denmark6 Risø National Laboratory for Sustainable Energy, Technical University of Denmark7 Fudan University8 Fudan University
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.