title: Multi-wavelength mid-infrared plasmonic antennas with single nanoscale focal point.
abstract: We propose and demonstrate a novel photonic-plasmonic antenna capable of confining electromagnetic radiation at several mid-infrared wavelengths to a single sub-wavelength spot. The structure relies on the coupling between the localized surface plasmon resonance of a bow-tie nanoantenna with the photonic modes of surrounding multi-periodic particle arrays. Far-field measurements of the transmission through the central bow-tie demonstrate the presence of Fano-like interference effects resulting from the interaction of the bow-tie antenna with the surrounding nanoparticle arrays. The near-field of the multi-wavelength antenna is imaged using an aperture-less near-field scanning optical microscope. This antenna is relevant for the development of near-field probes for nanoimaging, spectroscopy and biosensing.
authors: School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, Cambridge, Massachusetts 02138, USA.
authors: Romain
authors: R
authors: Blanchard
authors: Svetlana V
authors: SV
authors: Boriskina
authors: Patrice
authors: P
authors: Genevet
authors: Mikhail A
authors: MA
authors: Kats
authors: Jean-Philippe
authors: JP
authors: Tetienne
authors: Nanfang
authors: N
authors: Yu
authors: Marlan O
authors: MO
authors: Scully
authors: Luca
authors: L
authors: Dal Negro
authors: Federico
authors: F
authors: Capasso
mesh_terms: D003198:Computer Simulation; D007259:Infrared Rays; D008855:Microscopy, Electron, Scanning; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*