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Article Dans Une Revue Nano Letters Année : 2020

Quantifying the Role of the Surfactant and the Thermophoretic Force in Plasmonic Nano-optical Trapping

Quanbo Jiang
  • Fonction : Auteur
Benoît Rogez
  • Fonction : Auteur
Jean-Benoît Claude
  • Fonction : Auteur
Guillaume Baffou
Jérôme Wenger

Résumé

Plasmonic nanotweezers use intense electric field gradients to generate optical forces able to trap nano-objects in liquids. However, part of the incident light is absorbed into the metal, and a supplementary thermophoretic force acting on the nano-object arises from the resulting temperature gradient. Plasmonic nanotweezers thus face the challenge of disentangling the intricate contributions of the optical and thermophoretic forces. Here, we show that commonly added surfactants can unexpectedly impact the trap performance by acting on the thermophilic or thermophobic response of the nano-object. Using different surfactants in double nanohole plasmonic trapping experiments, we measure and compare the contributions of the thermophoretic and the optical forces, evidencing a trap stiffness 20× higher using sodium dodecyl sulfate (SDS) as compared to Triton X-100. This work uncovers an important mechanism in plasmonic nanotweezers and provides guidelines to control and optimize the trap performance for different plasmonic designs.
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Dates et versions

hal-03064997 , version 1 (14-12-2020)

Identifiants

Citer

Quanbo Jiang, Benoît Rogez, Jean-Benoît Claude, Guillaume Baffou, Jérôme Wenger. Quantifying the Role of the Surfactant and the Thermophoretic Force in Plasmonic Nano-optical Trapping. Nano Letters, 2020, 20 (12), pp.8811-8817. ⟨10.1021/acs.nanolett.0c03638⟩. ⟨hal-03064997⟩
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