title: Terahertz and mid-infrared plasmons in three-dimensional nanoporous graphene.
abstract: Two-dimensional (2D) graphene emerged as an outstanding material for plasmonic and photonic applications due to its charge-density tunability, high electron mobility, optical transparency and mechanical flexibility. Recently, novel fabrication processes have realised a three-dimensional (3D) nanoporous configuration of high-quality monolayer graphene which provides a third dimension to this material. In this work, we investigate the optical behaviour of nanoporous graphene by means of terahertz and infrared spectroscopy. We reveal the presence of intrinsic 2D Dirac plasmons in 3D nanoporous graphene disclosing strong plasmonic absorptions tunable from terahertz to mid-infrared via controllable doping level and porosity. In the far-field the spectral width of these absorptions is large enough to cover most of the mid-Infrared fingerprint region with a single plasmon excitation. The enhanced surface area of nanoporous structures combined with their broad band plasmon absorption could pave the way for novel and competitive nanoporous-graphene based plasmonic-sensors.
authors.affiliation: Istituto Italiano di Tecnologia and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Roma, Italy.|Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: Fausto
authors.initials: F
authors.lastname: D'Apuzzo
authors.affiliation: INFN and University of Rome La Sapienza, Department of Physics, P.le A. Moro 2, 00185 Rome, Italy.
authors.forename: Alba R
authors.initials: AR
authors.lastname: Piacenti
authors.affiliation: INFN and University of Rome La Sapienza, Department of Physics, P.le A. Moro 2, 00185 Rome, Italy.
authors.forename: Flavio
authors.initials: F
authors.lastname: Giorgianni
authors.affiliation: INFN and University of Rome La Sapienza, Department of Physics, P.le A. Moro 2, 00185 Rome, Italy.
authors.forename: Marta
authors.initials: M
authors.lastname: Autore
authors.affiliation: INFN-LNF, via E. Fermi 40, 00044 Frascati, Italy.
authors.forename: Mariangela Cestelli
authors.initials: MC
authors.lastname: Guidi
authors.affiliation: INFN-LNF, via E. Fermi 40, 00044 Frascati, Italy.
authors.forename: Augusto
authors.initials: A
authors.lastname: Marcelli
authors.affiliation: Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH, Methoden der Materialentwicklung, Albert-Einstein-Strasse 15, 12489 Berlin, Germany.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Schade
authors.affiliation: WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Ito
authors.affiliation: WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.|School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China.|CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan.
authors.forename: Mingwei
authors.initials: M
authors.lastname: Chen
authors.affiliation: CNR-IOM and Department of Physics, University of Rome La Sapienza, P.le A. Moro 2, 00185, Rome, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Lupi