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

• DOI: 10.1038/ncomms8915
• Publication Date: 2015-08-04T09:57:38Z
• Authors: Martín Caldarola; Pablo Albella; Emiliano Cortés; Mohsen Rahmani; Tyler Roschuk; Gustavo Grinblat; Rupert F. Oulton; Andrea V. Bragas; Stefan A. Maier
• Keywords: Nanophotonics

Nanoplasmonics has recently revolutionized our ability to control light on the nanoscale. Using metallic nanostructures with tailored shapes, it is possible efficiently focus into nanoscale field 'hot spots'. High enhancement factors have been achieved in such optical nanoantennas, enabling transformative science areas of single molecule interactions, highly enhanced nonlinearities and waveguiding. Unfortunately, these large enhancements come at price high losses due absorption metal, severely limiting real-world applications. Via realization a novel nanophotonic platform based dielectric form efficient nanoantennas ultra-low light-into-heat conversion, here we demonstrate an approach that overcomes limitations. We show dimer-like silicon-based produce both surface fluorescence Raman scattering, while same time generating negligible temperature increase their hot spots surrounding environments.