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arXiv · 2503.10139

Multiphysics optomechanical sensing of a liquid on the micron scale

Hamidreza Neshasteh·Amideddin Mataji-Kojouri·Clément Le Fur·Ilan Shlesinger·Marco Ravaro·Marc Gély·Sébastien Hentz·Guillaume Jourdan·Ivan Favero
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Abstract

We present an optomechanical device platform for characterization of optical, thermal, and rheological properties of fluids on the micron scale. A suspended silicon microdisk resonator with a vibrating mass of 100 fg and an effective measurement volume of less than a pL is used to monitor properties of different fluids at rest. By employing analytical models for thermo-optical effects, thermal diffusion and fluid-structure interactions, our platform determines the refractive index, thermal conductivity, viscosity, density and compressibility of the fluid, in a compact measurement setup. A single measurement takes as short as 70 microseconds, and the employed power can be less than 100 microwatts, guaranteeing measurement at rest and in thermal equilibrium.

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Hamidreza Neshasteh, Amideddin Mataji-Kojouri, Clément Le Fur, Ilan Shlesinger, Marco Ravaro, Marc Gély, Sébastien Hentz, Guillaume Jourdan, Ivan Favero. 2025-03-13. Multiphysics optomechanical sensing of a liquid on the micron scale. https://arxiv.org/abs/2503.10139

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