title: Deep-subwavelength imaging of both electric and magnetic localized optical fields by plasmonic campanile nanoantenna.
abstract: Tailoring the electromagnetic field at the nanoscale has led to artificial materials exhibiting fascinating optical properties unavailable in naturally occurring substances. Besides having fundamental implications for classical and quantum optics, nanoscale metamaterials provide a platform for developing disruptive novel technologies, in which a combination of both the electric and magnetic radiation field components at optical frequencies is relevant to engineer the light-matter interaction. Thus, an experimental investigation of the spatial distribution of the photonic states at the nanoscale for both field components is of crucial importance. Here we experimentally demonstrate a concomitant deep-subwavelength near-field imaging of the electric and magnetic intensities of the optical modes localized in a photonic crystal nanocavity. We take advantage of the "campanile tip", a plasmonic near-field probe that efficiently combines broadband field enhancement with strong far-field to near-field coupling. By exploiting the electric and magnetic polarizability components of the campanile tip along with the perturbation imaging method, we are able to map in a single measurement both the electric and magnetic localized near-field distributions.
authors.affiliation: 1] European Laboratory for Non-linear Spectroscopy, 50019 Sesto Fiorentino (FI), Italy [2] Department of Physics, University of Florence, 50019 Sesto Fiorentino (FI), Italy.
authors.forename: Niccolò
authors.initials: N
authors.lastname: Caselli
authors.affiliation: 1] European Laboratory for Non-linear Spectroscopy, 50019 Sesto Fiorentino (FI), Italy [2] Department of Physics, University of Florence, 50019 Sesto Fiorentino (FI), Italy.
authors.forename: Federico
authors.initials: F
authors.lastname: La China
authors.affiliation: Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Bao
authors.affiliation: Department of Physics, University of Trento, via Sommarive 14, 38123, Povo (TN), Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Riboli
authors.affiliation: Institute of Photonics and Nanotechnology, CNR, 00156 Roma, Italy.
authors.forename: Annamaria
authors.initials: A
authors.lastname: Gerardino
authors.affiliation: School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom.
authors.forename: Lianhe
authors.initials: L
authors.lastname: Li
authors.affiliation: School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom.
authors.forename: Edmund H
authors.initials: EH
authors.lastname: Linfield
authors.affiliation: COBRA Research Institute, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands.
authors.forename: Francesco
authors.initials: F
authors.lastname: Pagliano
authors.affiliation: COBRA Research Institute, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands.
authors.forename: Andrea
authors.initials: A
authors.lastname: Fiore
authors.affiliation: Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: P James
authors.initials: PJ
authors.lastname: Schuck
authors.affiliation: Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Stefano
authors.initials: S
authors.lastname: Cabrini
authors.affiliation: Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Alexander
authors.initials: A
authors.lastname: Weber-Bargioni
authors.affiliation: 1] European Laboratory for Non-linear Spectroscopy, 50019 Sesto Fiorentino (FI), Italy [2] Department of Physics, University of Florence, 50019 Sesto Fiorentino (FI), Italy.
authors.forename: Massimo
authors.initials: M
authors.lastname: Gurioli
authors.affiliation: 1] European Laboratory for Non-linear Spectroscopy, 50019 Sesto Fiorentino (FI), Italy [2] Department of Physics, University of Florence, 50019 Sesto Fiorentino (FI), Italy.
authors.forename: Francesca
authors.initials: F
authors.lastname: Intonti