title: Real-space mapping of Fano interference in plasmonic metamolecules.
abstract: An unprecedented control of the spectral response of plasmonic nanoantennas has recently been achieved by designing structures that exhibit Fano resonances. This new insight is paving the way for a variety of applications, such as biochemical sensing and surface-enhanced Raman spectroscopy. Here we use scattering-type near-field optical microscopy to map the spatial field distribution of Fano modes in infrared plasmonic systems. We observe in real space the interference of narrow (dark) and broad (bright) plasmonic resonances, yielding intensity and phase toggling between different portions of the plasmonic metamolecules when either their geometric sizes or the illumination wavelength is varied.
authors.affiliation: Nanooptics Group, CIC nanoGUNE Consolider, 20018 Donostia-San Sebastian, Spain.
authors.forename: Pablo
authors.initials: P
authors.lastname: Alonso-Gonzalez
authors.forename: Martin
authors.initials: M
authors.lastname: Schnell
authors.forename: Paulo
authors.initials: P
authors.lastname: Sarriugarte
authors.forename: Heidar
authors.initials: H
authors.lastname: Sobhani
authors.forename: Chihhui
authors.initials: C
authors.lastname: Wu
authors.forename: Nihal
authors.initials: N
authors.lastname: Arju
authors.forename: Alexander
authors.initials: A
authors.lastname: Khanikaev
authors.forename: Federico
authors.initials: F
authors.lastname: Golmar
authors.forename: Pablo
authors.initials: P
authors.lastname: Albella
authors.forename: Libe
authors.initials: L
authors.lastname: Arzubiaga
authors.forename: Felix
authors.initials: F
authors.lastname: Casanova
authors.forename: Luis E
authors.initials: LE
authors.lastname: Hueso
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Gennady
authors.initials: G
authors.lastname: Shvets
authors.forename: Rainer
authors.initials: R
authors.lastname: Hillenbrand
mesh_terms: D015374:Biosensing Techniques; D007368:Interferometry / Q000379:methods; D008422:Materials Testing; D008853:Microscopy / Q000379:methods; D036103:Nanotechnology / Q000379:methods*; D055095:Optics and Photonics; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013499:Surface Properties