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Proceedings Paper

Low-loss dielectric nanoantennas for surface-enhanced spectroscopies and nonlinear photonics (Conference Presentation)
Author(s): Gustavo Grinblat; Yi Li; Javier Cambiasso; Toshishiko Shibanuma; Michael P. Nielsen; Emiliano Cortés; Pablo Albella Echave; Aliaksandra Rakovich; Rupert F. Oulton; Stefan A. Maier

Paper Abstract

The initial excitement about the use of plasmonic nanostructures for the development of nanophotonic devices operating in the optical regime was later partially eclipsed with the observation that losses could, in some cases, overtake actual radiative properties [1]. In this scenario, dielectric nanoantennas have recently emerged as promising alternative candidates to plasmonic systems in the visible range [2]. When excited above their bandgap energies, high-refractive-index dielectric nanostructures can highly concentrate electric and magnetic fields within subwavelength volumes, while presenting ultra-low absorption compared to metals [3]. In particular, by locally enhancing the incident light intensity, dielectric nanoantennas are expected not only to produce negligible heating, but also boost nonlinear phenomena and surface-enhanced spectroscopies, since their efficiencies increase with the excitation density. In this presentation, Si, Ge, and GaP nanoantennas will be introduced as promising nanosystems for surface-enhanced fluorescence and Raman spectroscopies, as well as for generating efficient second and third harmonic light on the nanoscale at visible wavelengths [2,4-7]. It will be shown that their associated temperature increase at resonance can be over one order of magnitude lower than that corresponding to metals. At the same time, fluorescence enhancement factors of over 3000 and harmonic conversion efficiencies of nearly 0.01% will be demonstrated for suitably engineered dielectric nanostructures. Finally, hybrid dielectric/metallic nanoantennas will also be analyzed, and, in all cases, comparison will be made with reference plasmonic nanosystems. [1] Khurgin, J. B. Nat. Nanotech. 2015, 10, 2-6. [2] Caldarola, M. et al. Nat. Commun. 2015, 6, 7915. [3] Albella, P. et al. ACS Photonics 2014, 1, 524–529. [4] Grinblat, G. et al. Nano Lett. 2016, 16, 4635-4640. [5] Grinblat, G. et al. ACS Nano 2017, DOI: 10.1021/acsnano.6b07568. [6] Cambiasso, J.; Grinblat, G.; et al. Nano Lett 2017, DOI: 10.1021/acs.nanolett.6b05026. [7] Shibanuma, T.; Grinblat, G.; et al. Submitted, 2017.

Paper Details

Date Published: 18 October 2017
Proc. SPIE 10353, Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2017, 103530T (18 October 2017); doi: 10.1117/12.2273790
Show Author Affiliations
Gustavo Grinblat, Imperial College London (United Kingdom)
Yi Li, Imperial College London (United Kingdom)
Javier Cambiasso, Imperial College London (United Kingdom)
Toshishiko Shibanuma, Imperial College London (United Kingdom)
Michael P. Nielsen, Imperial College London (United Kingdom)
Emiliano Cortés, Imperial College London (United Kingdom)
Pablo Albella Echave, Imperial College London (United Kingdom)
Aliaksandra Rakovich, Imperial College London (United Kingdom)
Rupert F. Oulton, Imperial College London (United Kingdom)
Stefan A. Maier, Imperial College London (United Kingdom)

Published in SPIE Proceedings Vol. 10353:
Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2017
Manijeh Razeghi; Oleg Mitrofanov; José Luis Pau Vizcaíno; Chee Hing Tan, Editor(s)

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