Non-plasmonic nanoantennas for surface enhanced spectroscopies with ultra-low heat conversion

Martín Caldarola, Pablo Albella, Emiliano Cortés, Mohsen Rahmani, Tyler Roschuk, Gustavo Grinblat, Rupert F. Oulton, Andrea V. Bragas () and Stefan A. Maier ()
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Martín Caldarola: Laboratorio de Electrónica Cuántica, FCEN, Universidad de Buenos Aires
Pablo Albella: The Blackett Laboratory, Imperial College London
Emiliano Cortés: The Blackett Laboratory, Imperial College London
Mohsen Rahmani: The Blackett Laboratory, Imperial College London
Tyler Roschuk: The Blackett Laboratory, Imperial College London
Gustavo Grinblat: Laboratorio de Electrónica Cuántica, FCEN, Universidad de Buenos Aires
Rupert F. Oulton: The Blackett Laboratory, Imperial College London
Andrea V. Bragas: Laboratorio de Electrónica Cuántica, FCEN, Universidad de Buenos Aires
Stefan A. Maier: The Blackett Laboratory, Imperial College London

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms8915

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