NanoOptoMechanics in classical and quantum Liquids

Informations projet

NOMLI

N° de convention de subvention: 770933

DOI

10.3030/770933

Projet clôturé

Date de signature de la CE 9 Mars 2018

Date de début 1 Avril 2018

Date de fin 31 Mars 2025

Financé au titre de

• EXCELLENT SCIENCE - European Research Council (ERC)

Coût total

€ 2 292 068,28

Contribution de l’UE

€ 2 292 068,00

Coordonné par

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS
France

Periodic Reporting for period 5 - NOMLI (NanoOptoMechanics in classical and quantum Liquids)

Période du rapport: 2024-04-01 au 2025-03-31

Résumé du contexte et des objectifs généraux du projet

The ERC NOMLI project has been exploring nanoscale optomechanical systems evolving in liquids. This research was at the frontier of condensed matter, fluidics, optics, quantum physics, biophysics, engineering and nanotechnology.

Now established as a class of elementary quantum systems on their own, optomechanical resonators have recently pushed our capabilities to probe forces with higher sensitivity and time resolution, at the quantum limit of detection. In NOMLI, we used these capabilities to explore physical interactions in complex environments such as liquids and artificial fluids, or in interaction with biological objects, answering open questions in all these contexts.

Outputs of the project have been in basic science (polaritonic effects in optomechanics) but also in more practical fields, with the development of a micro-rheology method that enables characterizing very tiny liquid amounts and reveal their background viscosity. Biomedical application of this method is currently explored for diagnosis. More generally, NOMLI has established instruments and measurement protocols to gain in sensitivity and time-resolution using optomechanical probes that measure these complex physical systems. This has led to new instruments for biophysics and atomic force spectroscopy, which will impact on the elucidation of micro-biological processes.

Travail effectué depuis le début du projet jusqu’à la fin de la période considérée dans le rapport et principaux résultats atteints jusqu’à présent

Along the project, nano-optomechanics experiments at ultra-low temperature were developed, where the quantum regime of motion has been attained, and where force sensing experiments were implemented. A novel class of nano-optomechanical resonators was developed to establish an interface with artificial quantum fluids formed at low temperature, leading to the observation of polaritonic effects in optomechanics. Optomechanical experiments were run in classical liquids at room-temperature, and confronted to new hydrodynamic models adapted to optomechanical geometries. This led to the observation of non-Newtonian behaviors in common alcohols. Nano-optomechanical devices were put in interaction with micro-biological objects, such as a living cell in a physiological liquid, in order to gain resolution in biophysical measurements. Theoretical predictions were made on optomechanical phonon transport, polaritonic optomechanical forces, and learning strategies for microwave signals, which all rely on collective optomechanical effects.

Progrès au-delà de l’état des connaissances et impact potentiel prévu (y compris l’impact socio-économique et les conséquences sociétales plus larges du projet jusqu’à présent)

The NOMLI project has produced outputs beyond the state of the art in several domains. Here is a selection:
1. a new micro-rheology method operating in the ultra-high frequency range, offering high-throughput characterization of small liquid samples;
2. the answer, with real-time observation, to the question of the evaporation mode of a nanoscale droplet;
3. a method to resolve sub-microseconds processes in a living cell;
4. an ultra-low temperature optomechanics set-up compatible with atomic force measurements;
5. the observation of whispering gallery polaritons and of their effect on optomechanical interactions.

A nano-optomechanical resonator beneath a breaking wave