INVESTIGADORES
GOLMAR Federico
congresos y reuniones científicas
Título:
Mapping Near-Field Coupling Effects in Infrared Gap Antennas
Autor/es:
P. ALONSO; P. ALBELLA; L. ARZUBIAGA; M. SCHNELL; J. CHEN; F. HUTH; F. GOLMAR; F. CASANOVA; L. HUESO; J. AIZPURUA; R. HILLENBRAND
Lugar:
Heidelberg
Reunión:
Encuentro; Summer school: "Plasmonics, Functionalization and Biosensing"; 2011
Institución organizadora:
Kirchhoff Institut for Physics
Resumen:
The vector near-field distribution of infrared gap antennas (linear dipole antennas coupled via a nanometric gap) is mapped by scattering-type scanning near-field microscopy (s-SNOM). The images provide direct experimental evidence of strong in-plane near-field localization inside a gap as small as 50 nm. By measuring the gap fields as a function of the total antenna length (near-field spectroscopy), we observe a clear resonance shift compared to uncoupled linear dipole antennas, thus verifying strong near-field coupling via the gap. We also find significant differences between near-field and far-field spectra of the antennas and discuss their implications.
