title: Surface-enhanced infrared spectroscopy using metal oxide plasmonic antenna arrays.
abstract: We successfully demonstrate surface-enhanced infrared spectroscopy using arrays of indium tin oxide (ITO) plasmonic nanoantennas. The ITO antennas show a strongly reduced plasmon wavelength, which holds promise for ultracompact antenna arrays and extremely subwavelength metamaterials. The strong plasmon confinement and reduced antenna cross section allows ITO antennas to be integrated at extremely high densities with no loss in performance due to long-range transverse interactions. By further reducing the spacing of antennas in the arrays, we access the regime of plasmonic near field coupling where the response is enhanced for both Au and ITO devices. Ultracompact ITO antennas with high spatial and spectral selectivity in spectroscopic applications offer a viable new platform for infrared plasmonics, which may be combined with other functionalities of these versatile materials in devices.
authors.affiliation: Physics and Astronomy, Faculty of Physical Sciences and Engineering, ‡Nano Group, Faculty of Physical Sciences and Engineering, and §Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton , Highfield, Southampton SO17 1BJ, United Kingdom.
authors.forename: Martina
authors.initials: M
authors.lastname: Abb
authors.forename: Yudong
authors.initials: Y
authors.lastname: Wang
authors.forename: Nikitas
authors.initials: N
authors.lastname: Papasimakis
authors.forename: C H
authors.initials: CH
authors.lastname: de Groot
authors.forename: Otto L
authors.initials: OL
authors.lastname: Muskens
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000295:instrumentation*; D010316:Particle Size; D013055:Spectrophotometry, Infrared / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D017971:Tin Compounds / Q000737:chemistry*; D014159:Transducers
chemical_list: D017971:Tin Compounds; C109984:indium tin oxide