title: Experimental verification of the spectral shift between near- and far-field peak intensities of plasmonic infrared nanoantennas.
abstract: Theory predicts a distinct spectral shift between the near- and far-field optical response of plasmonic antennas. Here we combine near-field optical microscopy and far-field spectroscopy of individual infrared-resonant nanoantennas to verify experimentally this spectral shift. Numerical calculations corroborate our experimental results. We furthermore discuss the implications of this effect in surface-enhanced infrared spectroscopy.
authors.affiliation: CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Alonso-González
authors.affiliation: CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain and Centro de Física de Materiales (CSIC-UPV/EHU) and Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Albella
authors.affiliation: Kirchhoff Institute for Physics, University of Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Neubrech
authors.affiliation: Kirchhoff Institute for Physics, University of Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Huck
authors.affiliation: CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain and Centro de Física de Materiales (CSIC-UPV/EHU) and Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Chen
authors.affiliation: CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain and I.N.T.I.-CONICET, Avenida General Paz 5445, Edificio 42, B1650JKA, San Martín, Bs As, Argentina.
authors.forename: F
authors.initials: F
authors.lastname: Golmar
authors.affiliation: CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain and IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Casanova
authors.affiliation: CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain and IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain.
authors.forename: L E
authors.initials: LE
authors.lastname: Hueso
authors.affiliation: Kirchhoff Institute for Physics, University of Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Pucci
authors.affiliation: Centro de Física de Materiales (CSIC-UPV/EHU) and Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Aizpurua
authors.affiliation: CIC nanoGUNE, 20018 Donostia-San Sebastián, Spain and IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Hillenbrand