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arXiv · 1901.08284

Thermally limited force microscopy on optically trapped single metallic nanoparticles

Gabriel Schnoering·Yoseline Rosales-Cabara·Hugo Wendehenne·Antoine Canaguier-Durand·Cyriaque Genet
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Abstract

We propose and evaluate a new type of optical force microscope based on a standing wave optical trap. Our microscope, calibrated in-situ and operating in a dynamic mode, is able to trap, without heating, a single metallic nanoparticle of 150 nm that acts as a highly sensitive probe for external radiation pressure. An Allan deviation-based stability analysis of the setup yields an optimal 0.1 Hz measurement bandwidth over which the microscope is thermally limited. Over this bandwidth, and with a genuine sine-wave external drive, we demonstrate an optical force resolution down to 3 fN in water at room temperature with a dynamical range for force detection that covers almost 2 orders of magnitude. This resolution is reached both in the confined and freely diffusing regimes of the optical trap. In the latter, we measure $10^{-11}$ m induced displacements on the trapped nanoparticle, spatially confined within less than 25 nm along the optical axis.

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Gabriel Schnoering, Yoseline Rosales-Cabara, Hugo Wendehenne, Antoine Canaguier-Durand, Cyriaque Genet. 2019-01-24. Thermally limited force microscopy on optically trapped single metallic nanoparticles. https://doi.org/10.1103/physrevapplied.11.034023

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