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About the Optoflow group :






Optofluidics refers to the microfluidic area where optics and fluids are coupled together to create optical functions in fluids or conversely, to actuate fluids at a micrometric scale with optics. The LOMA optofluidic group aims at investigating these couplings with liquids and liquid interfaces and their consequences when photons exchange momentum and transfer energy.
To investigate these effects, we build setups dedicated to the optomechanics of liquid interfaces (radiation pressure) and bulk (scattering forces), optical stretching, jet instability, liquid fibre stabilization, liquid lenses and optical fountains. We also applied these concepts to optorheology, i.e. the characterization of the rheology of complex fluids at small scale. Fluid flows induced by laser heating in bulk (thermoconvection) and at interfaces (thermocapillarity flows) are also investigated with applications going from laser microfluidics & digital optofluidics to laser-driven evaporation & surface patterning.
We are always seeking for motivated interns, PhDs, or postdocs to join our group. Please do not hesitate to contact us, to discuss science and possible fundings !
Selected publications
- Raphael Saiseau, Henri Truong, Thomas Guérin, Ulysse Delabre, and Jean-Pierre Delville, Decay dynamics of a single spherical domain in near-critical phase-separated conditions » Phys. Rev. Lett. 133, 018201, 2024,
- Saiseau, R., Pedersen, C., Benjana, A., Carlson, A., Delabre, U., Salez, T. and Delville, J.P., (2022). Near-critical spreading of droplets. Nature Communications, 13, 7442.
- Bai, Q., Shupyk, I., Vauriot, L., Majimel, J., Labrugere, C., Delville, M. H., & Delville, J. P. (2021). Design of metal@ titanium oxide nano-heterodimers by laser-driven photodeposition: growth mechanism and modeling. ACS nano, 15(2), 2947-2961.
- Verma, G., Chesneau, H., Chraïbi, H., Delabre, U., Wunenburger, R., & Delville, J. P. (2020). Contactless thin-film rheology unveiled by laser-induced nanoscale interface dynamics. Soft Matter, 16(34), 7904-7915.
- Girot, A., Petit, J., Saiseau, R., Guérin, T., Chraibi, H., Delabre, U., & Delville, J. P. (2019). Conical interfaces between two immiscible fluids induced by an optical laser beam. Physical review letters, 122(17), 174501.
- Aubret, A., Youssef, M., Sacanna, S., & Palacci, J. (2018). Targeted assembly and synchronization of self-spinning microgears. Nature Physics, 14(11), 1114-1118.
- Rivière, D., Selva, B., Chraibi, H., Delabre, U., & Delville, J. P. (2016). Convection flows driven by laser heating of a liquid layer. Physical Review E, 93(2), 023112.
- de Saint Vincent, M. R., & Delville, J. P. (2016). Fragmentation mechanisms of confined co-flowing capillary threads revealed by active flow focusing. Physical Review Fluids, 1(4), 043901.
Research activities
Radiation pressure at interfaces
Optorheology
Interface instabilities
Active Matter at the Nanoscale
Active matter is constituted of agents that convert energy into work or motion. This can range from flocks of birds to nanomotors in the cells, which in turn trigger the individual and collective cell dynamics. A particularity of such systems is their non-equilibrium nature : particles interact dynamically while breaking time reversal symmetry, which allow them to exhibit dynamical behaviors impossible to reach for an equilibrium system.
In this project, we aim at implementing and analyzing the dynamics of artificial, nanoscale objects that are able to self-propel. These nanoparticles (10-100 nm) offer new opportunitites in the active matter community, as they enable in particular the investigation of active matter in 3D, while examining precisely how the balance between thermal noise and activity influences their dynamics.
We use optical microscopy setups to control, actuate, and probe the dynamics of the particles, coupled to correlation and statistical methods to extract information on small spatial and short temporal scales.
Optical stretching of biomimetic systems
We use radiation pressure effects to deform and manipulate single biomimetic systems such as cells or vesicles without any contact in order to characterize their rheological properties. We build a photonic integrated microlfluidic device to trap and deform single object. Mechnical properties such as bending modulus or Young modulus are directly related to the deformation of biomimetic objects. These strategies have also been applied to mitotic cells to identify key mechanical proteins involved in cell rounding process during cell division.
Manipulation and biophysical characterization of GUVs with an optical stretcher
Gheorghe Cojoc, Antoine Girot, Ulysse Delabre, Jochen Guck, The Giant Vesicle Book , Editors C. Marques and R. Dimova
ISBN-13: 9781498752176, ISBN-10: 1498752179, Publisher CRC, September 2019
https://www.taylorfrancis.com/books/9781315152516
Deformation of phospholipid vesicles in a optical stretcher
U. Delabre, K. Feld, E. Crespo, G. Whyte, C. Sykes, U. Seifert & J. Guck
Soft Matter (2015)
Changes in Ect2 Localization Couple Actomyosin-dependent Cell Shape Changes to Mitotic Progression
Helen K. Matthews, Ulysse Delabre, Jennifer L. Rohn, Jochen Guck, Patricia Kunda and Buzz Baum
Dev Cell (2012) 23(2) pp. 371 – 383
Thermal effects of light in liquids
Our goal is to control the organization of particles at micro and nano scales in order to create new materials. We develop new strategies based on photonics , absorption of light to control flows either Mangoni or convection flows to improve the versatility and resolution of deposits.
Members
Permanent researchers
![]() Jean-Pierre Delville CNRS Research Director |
![]() Associate Professor |
![]() Hamza Chraïbi Associate Professor |
![]() Antoine Aubret CNRS researcher |
Non-permanent
Eugénie Pariente – PhD with JP. Delville (collab. ICMCB).
Yoann De Figueiredo – PhD with A. Aubret.
Miquel Torras – Postdoc with JP. Delville (collab. ICMCB).
Alumni (past 5 years)
Fenghuan Zhao – PhD in collaboration with ICMCB (Bordeaux).
Marie Adier – Postdoc in collaboration with Pprime Institute (Poitiers) – with U. Delabre- Now at Horiba, Paris.
Nicolas Alexandre Goy – PhD (2021), now physics teacher.
Raphael Saiseau – PhD (2020), now postdoc at MSC Lab, Paris.
Junjie Hao – PhD (2020), now postdoc.
Hugo Chesneau – PhD (2020), now postdoc at CEA.
Gopal Verma – Postdoc (2019), now junior scientist.
Qingguo Bai – PhD (2019), now postdoc.
Antoine Girot – PhD (2018), now postdoc at Max Planck Institute.
David Rivière – PhD (2016), now data scientist.
Publications
2022
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- Saiseau, R., Pedersen, C., Benjana, A., Carlson, A., Delabre, U., Salez, T. and Delville, J.P., (2022). Near-critical spreading of droplets. Nature Communications, 13, 7442.
- Goy, N.A., Bruni, N., Girot, A., Delville, J.P. and Delabre, U. (2022). Thermal Marangoni trapping driven by laser absorption in evaporating droplets for particle deposition. Soft Matter, 2022, 18, 7949 – 7958
- Martinet, Q., Aubret, A. and Palacci, J. (2022). Rotation Control, Interlocking, and Self-Positioning ofActive Cogwheels. Adv. Intell. Syst, 2200129.
- U. Delabre, Smartphonique, Faites de votre smartphone un labo de physique, 2nd Edition, DUNOD (2022)
- U. Delabre, N. Bruni, N-A Goy, A. Girot, La smartphonique au service de la photonique, Photoniques, 115 (2022)
2021
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- Aubret, A., Martinet, Q., & Palacci, J. (2021). Metamachines of Pluripotent Colloids. Nature Communications, 12, 6398.
- Hao, J., Liu, H., Wang, K., Sun, X. W., Delville, J. P., & Delville, M. H. (2021). Hole Scavenging and Electron–Hole Pair Photoproduction Rate: Two Mandatory Key Factors to Control Single-Tip Au–CdSe/CdS Nanoheterodimers. ACS nano.
- Bai, Q., Shupyk, I., Vauriot, L., Majimel, J., Labrugere, C., Delville, M. H., & Delville, J. P. (2021). Design of metal@ titanium oxide nano-heterodimers by laser-driven photodeposition: growth mechanism and modeling. ACS nano, 15(2), 2947-2961.
2020
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- Chesneau, H., Petit, J., Chraibi, H., & Delville, J. P. (2020). Dynamics and flow characterization of liquid fountains produced by light scattering. Physical Review Fluids, 5(2), 024002.
- Gandhi, T., Mac Huang, J., Aubret, A., Li, Y., Ramananarivo, S., Vergassola, M., & Palacci, J. (2020). Decision-making at a T-junction by gradient-sensing microscopic agents. Physical Review Fluids, 5(10), 104202.
- Youssef, M., Morin, A., Aubret, A., Sacanna, S., & Palacci, J. (2020). Rapid characterization of neutral polymer brush with a conventional zetameter and a variable pinch of salt. Soft matter, 16(17), 4274-4282.
- Aubret, A., Dolique, V., Piednoir, A., Dujardin, C., Kulzer, F., & Houel, J. (2020). Single CdSe/CdS colloidal nanocrystals embedded in an Ultra-Pure SiO2 matrix deposited by ion beam sputtering. Semiconductor Science and Technology, 35(5), 055005.
- Bobroff, J., Bouquet, F., & Delabre, U. (2020). Enseigner les sciences expérimentales à l’heure de la distanciation sociale. The Conversation.
- Bobroff, J., Bouquet, F., & Delabre, U. (2020). Teaching experimental science in a time of social distancing. The Conversation.
- Girot, A., Goy, N. A., Vilquin, A., & Delabre, U. (2020). Studying ray optics with a smartphone. The Physics Teacher, 58(2), 133-135.
- Bobroff, J., Bouquet, F., & Delabre, U. (2020). Enseigner la physique autrement. La Recherche, (556).
- Verma, G., Chesneau, H., Chraïbi, H., Delabre, U., Wunenburger, R., & Delville, J. P. (2020). Contactless thin-film rheology unveiled by laser-induced nanoscale interface dynamics. Soft Matter, 16(34), 7904-7915.
2019
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- Girot, A., Petit, J., Saiseau, R., Guérin, T., Chraibi, H., Delabre, U., & Delville, J. P. (2019). Conical interfaces between two immiscible fluids induced by an optical laser beam. Physical review letters, 122(17), 174501.
- Bai, Q., Lavenas, M., Vauriot, L., Le Trequesser, Q., Hao, J., Weill, F., … & Delville, M. H. (2019). Hydrothermal transformation of titanate scrolled nanosheets to anatase over a wide pH range and contribution of triethanolamine and oleic acid to control the morphology. Inorganic chemistry, 58(4), 2588-2598.
2018
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- Aubret, A., Orrit, M. A. G. J., & Kulzer, F. (2018). Understanding local-field correction factors in the framework of the Onsager-Bottcher model. ChemPhysChem, 20(3), 345-355.
- Aubret, A., & Palacci, J. (2018). Diffusiophoretic design of self-spinning microgears from colloidal microswimmers. Soft matter, 14(47), 9577-9588.
- Aubret, A., Youssef, M., Sacanna, S., & Palacci, J. (2018). Targeted assembly and synchronization of self-spinning microgears. Nature Physics, 14(11), 1114-1118.
- Delabre, U., Goy, N. A., Grolleau, A., Dufour, N., Lavaud, M., & Denis, Z. (2018). Des travaux pratiques smartphones à l’université. Bulletin de l’Union des Physiciens (1907-2003), 112(1003), 655-665.
2017
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- Goy, N. A., Denis, Z., Lavaud, M., Grolleau, A., Dufour, N., Deblais, A., & Delabre, U. (2017). Surface tension measurements with a smartphone. The Physics Teacher, 55(8), 498-499.
- Maali, A., Boisgard, R., Chraibi, H., Zhang, Z., Kellay, H., & Würger, A. (2017). Viscoelastic drag forces and crossover from no-slip to slip boundary conditions for flow near air-water interfaces. Physical review letters, 118(8), 084501.
- Aubret, A., Ramananarivo, S., & Palacci, J. (2017). Eppur si muove, and yet it moves: Patchy (phoretic) swimmers. Current Opinion in Colloid & Interface Science, 30, 81-89.
2016
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- Rivière, D., Selva, B., Chraibi, H., Delabre, U., & Delville, J. P. (2016). Convection flows driven by laser heating of a liquid layer. Physical Review E, 93(2), 023112.
- Aubret, A., Houel, J., Pereira, A., Baronnier, J., Lhuillier, E., Dubertret, B., … & Pillonnet, A. (2016). Nondestructive Encapsulation of CdSe/CdS Quantum Dots in an Inorganic Matrix by Pulsed Laser Deposition. ACS applied materials & interfaces, 8(34), 22361-22368.
- de Saint Vincent, M. R., & Delville, J. P. (2016). Fragmentation mechanisms of confined co-flowing capillary threads revealed by active flow focusing. Physical Review Fluids, 1(4), 043901.
- Pascu, M. L., Andrei, I. R., & Delville, J. P. (2016). Laser-induced jetting and controlled droplet formation. Optofluidics, Microfluidics and Nanofluidics, 3(1).
- Aubret, A., Pillonnet, A., Houel, J., Dujardin, C., & Kulzer, F. (2016). CdSe/ZnS quantum dots as sensors for the local refractive index. Nanoscale, 8(4), 2317-2325.
Ressources
Outreach
Discover physics and make experiments with your smartphone !
Here is a link grouping ressources for those interested :
http://smartphonique.fr/
and find the book of Ulysse DELABRE, DUNOD
https://www.dunod.com/sciences-techniques/smartphonique-experiences-physique-avec-un-smartphone
Physics of everyday-life objects
Videos from the online course (MOOC) ‘Physique des Objets du Quotidien’ (Physics of everyday-life objects): from your microwave to your smartphone :
https://www.canal-u.tv/producteurs/universite_de_bordeaux/physique_des_objets_du_quotidien/les_smartphones
Movies are available online all year long.
Media
Collaborations
Books
Contact
News
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- 2024-09 : A new pre-print is available: « Quantitative measurements of non-equilibrium interactions
of catalytic microswimmers with dual colloidal tracers », check it here ! - 2024-03 : Our article « Decay dynamics of a single spherical domain in near-critical phase-separated conditions » has been accepted in Physical Review Letters, and is Highlighted in APS !
- 2022-12-02 : Our Nature Communications about Near critical spreading of droplets is online !
- 2022-10-26: Our Paper on Thermal Marangoni is in press : Goy, N.A., Bruni, N., Girot, A., Delville, J.P. and Delabre, U. (2022). Thermal Marangoni trapping driven by laser absorption in evaporating droplets for particle deposition. Soft Matter, 2022, 18, 7949 – 7958
- 2022-09 : Our new paper on Thermal Marangoni trapping inside evaporating droplet has been accepted at Soft Matter
- 2022-07 : Our new paper on active cogwheels has been accepeted at Advanced Intelligent Systems
- 2021-10 : Our new paper on active micromachines has been published at Nature Communications !
- 2021-10 : Organization of the Waves, Fluids & Interfaces workshop at Lille !
- 2024-09 : A new pre-print is available: « Quantitative measurements of non-equilibrium interactions
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- 2021-08 : Our new paper on the synthesis of janus particles by photodeposition is now out in ACS Nano, check it out !
- 2021-07 : Congratulations to Nicolas Alexandre Goy for successfully defending his PhD thesis !