title: Non-plasmonic nanoantennas for surface enhanced spectroscopies with ultra-low heat conversion.
abstract: Nanoplasmonics has recently revolutionized our ability to control light on the nanoscale. Using metallic nanostructures with tailored shapes, it is possible to efficiently focus light into nanoscale field 'hot spots'. High field enhancement factors have been achieved in such optical nanoantennas, enabling transformative science in the areas of single molecule interactions, highly enhanced nonlinearities and nanoscale waveguiding. Unfortunately, these large enhancements come at the price of high optical losses due to absorption in the metal, severely limiting real-world applications. Via the realization of a novel nanophotonic platform based on dielectric nanostructures to form efficient nanoantennas with ultra-low light-into-heat conversion, here we demonstrate an approach that overcomes these limitations. We show that dimer-like silicon-based single nanoantennas produce both high surface enhanced fluorescence and surface enhanced Raman scattering, while at the same time generating a negligible temperature increase in their hot spots and surrounding environments.
authors.affiliation: Laboratorio de Electrónica Cuántica, Departamento de Física, FCEN, Universidad de Buenos Aires, Intendente Güiraldes 2160, C1428EGA Buenos Aires, Argentina - IFIBA CONICET, Argentina.
authors.forename: Martín
authors.initials: M
authors.lastname: Caldarola
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, UK.
authors.forename: Pablo
authors.initials: P
authors.lastname: Albella
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, UK.
authors.forename: Emiliano
authors.initials: E
authors.lastname: Cortés
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, UK.
authors.forename: Mohsen
authors.initials: M
authors.lastname: Rahmani
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, UK.
authors.forename: Tyler
authors.initials: T
authors.lastname: Roschuk
authors.affiliation: Laboratorio de Electrónica Cuántica, Departamento de Física, FCEN, Universidad de Buenos Aires, Intendente Güiraldes 2160, C1428EGA Buenos Aires, Argentina - IFIBA CONICET, Argentina.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Grinblat
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, UK.
authors.forename: Rupert F
authors.identifier: 0000000250703623
authors.initials: RF
authors.lastname: Oulton
authors.affiliation: Laboratorio de Electrónica Cuántica, Departamento de Física, FCEN, Universidad de Buenos Aires, Intendente Güiraldes 2160, C1428EGA Buenos Aires, Argentina - IFIBA CONICET, Argentina.
authors.forename: Andrea V
authors.initials: AV
authors.lastname: Bragas
authors.affiliation: The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, UK.
authors.forename: Stefan A
authors.initials: SA
authors.lastname: Maier