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Theses

Acting on a brownian probe : from optical forces to optimal thermodynamic protocols

Abstract : This thesis explores the behaviour of an optically trapped Brownian particle, both as a probe of optical forces and thermodynamic protocols. A particular optical trap is developed allowing the dynamic mode measurement of radiation pressure forces at the femtonewton scale. Such configuration allows to stably trap chiral metallic nanopyramides whose enantiomeric form can be recognized in situ by a polarimetric measurement coupled to the trap. This work paves the way for measurements of chiral optical forces at the nanoscale. Finally, we study protocols controlling the relaxation of the trapped particle between two equilibrium states. We theoretically identify protocols optimized from the point of view of the transfer time between the two equilibria and the associated energetic cost. We experimentally implement these protocols and demonstrate their optimality through a universal time-energy exclusion relationship.
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https://tel.archives-ouvertes.fr/tel-03376526
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Submitted on : Wednesday, October 13, 2021 - 3:21:40 PM
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Yoseline Rosales Cabara. Acting on a brownian probe : from optical forces to optimal thermodynamic protocols. Physics [physics]. Université de Strasbourg, 2020. English. ⟨NNT : 2020STRAF032⟩. ⟨tel-03376526⟩

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