Imaging the Localized Plasmon Resonance Modes in Graphene Nanoribbons.

Autor: Hu F; Department of Physics and Astronomy, U.S. DOE Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States., Luan Y; Department of Physics and Astronomy, U.S. DOE Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States., Fei Z; Department of Physics and Astronomy, U.S. DOE Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States., Palubski IZ; Department of Physics and Astronomy, U.S. DOE Ames Laboratory, Iowa State University , Ames, Iowa 50011, United States., Goldflam MD; Department of Physics, University of California at San Diego , La Jolla, California 92093, United States.; Sandia National Laboratories , Albuquerque, New Mexico 87185, United States., Dai S; Department of Physics, University of California at San Diego , La Jolla, California 92093, United States., Wu JS; Department of Physics, University of California at San Diego , La Jolla, California 92093, United States., Post KW; Department of Physics, University of California at San Diego , La Jolla, California 92093, United States., Janssen GCAM; Department of Precision and Microsystems Engineering, Delft University of Technology , Mekelweg 2, 2628 CD Delft, Netherland., Fogler MM; Department of Physics, University of California at San Diego , La Jolla, California 92093, United States., Basov DN; Department of Physics, University of California at San Diego , La Jolla, California 92093, United States.; Department of Physics, Columbia University , New York, New York 10027, United States.
Jazyk: angličtina
Zdroj: Nano letters [Nano Lett] 2017 Sep 13; Vol. 17 (9), pp. 5423-5428. Date of Electronic Publication: 2017 Aug 18.
DOI: 10.1021/acs.nanolett.7b02029
Abstrakt: We report a nanoinfrared (IR) imaging study of the localized plasmon resonance modes of graphene nanoribbons (GNRs) using a scattering-type scanning near-field optical microscope (s-SNOM). By comparing the imaging data of GNRs that are aligned parallel and perpendicular to the in-plane component of the excitation laser field, we observed symmetric and asymmetric plasmonic interference fringes, respectively. Theoretical analysis indicates that the asymmetric fringes are formed due to the interplay between the localized surface plasmon resonance (SPR) mode excited by the GNRs and the propagative surface plasmon polariton (SPP) mode launched by the s-SNOM tip. With rigorous simulations, we reproduce the observed fringe patterns and address quantitatively the role of the s-SNOM tip on both the SPR and SPP modes. Furthermore, we have seen real-space signatures of both the dipole and higher-order SPR modes by varying the ribbon width.
Databáze: MEDLINE