NDLI: Luminescent nanoparticle trapping with far-field optical fiber-tip tweezers

Content Provider	Royal Society of Chemistry (RSC)
Author	Dantelle, Géraldine Leménager, Godefroy Decombe, Jean-Baptiste Francs, Gérard Colas des Fick, Jochen Huant, Serge Valdivia-Valero, Francisco J. Gacoin, Thierry
Copyright Year	2016
Abstract	We report stable and reproducible trapping of luminescent dielectric YAG:Ce3+ nanoparticles with sizes down to 60 nm using far-field dual fiber tip optical tweezers. The particles are synthesized by a specific glycothermal route followed by an original protected annealing step, resulting in significantly enhanced photostability. The tweezers properties are analyzed by studying the trapped particles residual Brownian motion using video or reflected signal records. The trapping potential is harmonic in the transverse direction to the fiber axis, but reveals interference fringes in the axial direction. Large trapping stiffness of 35 and 2 pN μm−1 W−1 is measured for a fiber tip-to-tip distance of 3 μm and 300 nm and 60 nm particles, respectively. The forces acting on the nanoparticles are discussed within the dipolar approximation (gradient and scattering force contributions) or exact calculations using the Maxwell Stress Tensor formalism. Prospects for trapping even smaller particles are discussed.
Starting Page	5334
Ending Page	5342
Page Count	9
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	8
Issue Number	9
Journal	Nanoscale
DOI	10.1039/c5nr07727c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Brownian motion Maxwell stress tensor Optical tweezers Micrometer Stiffness Dielectric Nucleic acid thermodynamics Harmonic oscillator
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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