Thermally limited force microscopy on optically trapped single metallic nanoparticles
| Autor: | Schnoering, Gabriel, Rosales-Cabara, Yoseline, Wendehenne, Hugo, Canaguier-Durand, Antoine, Genet, Cyriaque |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. Applied 11, 034023 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevApplied.11.034023 |
| Popis: | 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. Comment: 10 pages, 8 figures |
| Databáze: | arXiv |
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