Zhu, Xiaolong5; Yan, Wei8; Jepsen, Peter Uhd8; Hansen, Ole4; Mortensen, N. Asger8; Xiao, Sanshui8
1 Department of Photonics Engineering, Technical University of Denmark2 Structured Electromagnetic Materials, Department of Photonics Engineering, Technical University of Denmark3 Teraherts Technologies and Biophotonics, Department of Photonics Engineering, Technical University of Denmark4 Experimental Surface and Nanomaterials Physics, Department of Physics, Technical University of Denmark5 Department of Micro- and Nanotechnology, Technical University of Denmark6 Silicon Microtechnology, Department of Micro- and Nanotechnology, Technical University of Denmark7 Center for Individual Nanoparticle Functionality, Center, Technical University of Denmark8 Center for Nanostructured Graphene, Center, Technical University of Denmark
We experimentally demonstrate graphene-plasmon polariton excitation in a continuous graphene monolayer resting on a two-dimensional subwavelength silicon grating. The subwavelength silicon grating is fabricated by a nanosphere lithography technique with a self-assembled nanosphere array as a template. Measured transmission spectra illustrate the excitation of graphene-plasmon polaritons, which is further supported by numerical simulations and theoretical prediction of plasmon-band diagrams. Our grating-assisted coupling to graphene-plasmon polaritons forms an important platform for graphene-based opto-electronics applications.