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Proceedings Paper

Addressing nanoantennas with slow Bloch mode cavity: application to optical trapping (Conference Presentation)
Author(s): Laurent Milord; Cécile Jamois; Xavier Letartre; Pierre Viktorovitch; Ali El Eter; Thierry Grosjean; Fadi Issam Baida; Taha Benyattou

Paper Abstract

Photonic crystal and plasmonic structures are the two main approaches used in nanophotonic for efficiently confining and enhancing the electromagnetic field at subwavelength scale. For these reasons, these two approaches have been both used for the optical trapping of nanometric particle. We present, here, experimental results showing that structures combining both photonic crystal and nanoantennas could lead to improved trapping performances. In previous theoretical papers [1, 2] we have shown that when the critical coupling between a photonic crystal and a nanoantenna is reached, a large Gaussian beam could be efficiently coupled to a single nanoantenna. In this way, it is possible to generate a nanometric hotspot in the nanoantenna leading to a very efficient optical trap. The experimental demonstration of this effect has been obtained on an SOI sample consisting in a gold nanoantenna located at the centre of a photonic crystal cavity. Stable trapping of 100 nm diameter nanoparticle has been observed using a 5mW laser at 1.31µm with a 5µm waist. The nanoparticle are trapped above the nanoantenna gap and a normalized trap stiffness of 0.3 fN.nm-1.mW-1 is measured. This result demonstrates the interest of this approach. We will discuss and compare it to the state of the art of nanotweezers. [1] A. El Eter et al. Opt. Express 22, 14464 (2014). [2] A. Belarouci et al. Opt. Express 18, A381 (2010).

Paper Details

Date Published: 28 April 2017
PDF: 1 pages
Proc. SPIE 10113, High Contrast Metastructures VI, 1011305 (28 April 2017); doi: 10.1117/12.2252274
Show Author Affiliations
Laurent Milord, Institut des Nanotechnologies de Lyon (France)
Cécile Jamois, Institut des Nanotechnologies de Lyon (France)
Xavier Letartre, Institut des Nanotechnologies de Lyon (France)
Pierre Viktorovitch, Institut des Nanotechnologies de Lyon (France)
Ali El Eter, FEMTO-ST (France)
Thierry Grosjean, FEMTO-ST (France)
Fadi Issam Baida, FEMTO-ST (France)
Taha Benyattou, Institut des Nanotechnologies de Lyon (France)

Published in SPIE Proceedings Vol. 10113:
High Contrast Metastructures VI
Connie J. Chang-Hasnain; Andrei Faraon; Fumio Koyama; Weimin Zhou, Editor(s)

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