BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Memento EPFL// BEGIN:VEVENT SUMMARY:MechE Colloquium: Acoustic manipulation: from holographic micro-tw eezers to quantum analogues DTSTART:20230502T120000 DTEND:20230502T130000 DTSTAMP:20260406T050802Z UID:7ca2f6541396c7a02aa5a2b5014a49fad248f5967038b2c61e0619e5 CATEGORIES:Conferences - Seminars DESCRIPTION:Prof. Michael Baudoin\, Université de Lille\nAbstract: The ab ility to pick up and manipulate micro-objects selectively and in 3D with s ingle-beam optical tweezers have led to tremendous developments in physics and microbiology\, recognized by the Nobel prizes of S. Chu and A. Ashkin . Nevertheless\, optical tweezers have stringent limitations for life scie nce owing to (i) reported phototoxicity inducing detrimental effects on bi ological tissues\, (ii) their inability to operate in vivo in optically op aque media\, and (iii) the limited range of forces\, which can be applied on biosamples (typically < 20pN). In this regard\, acoustical tweezers are a prominent technology since they are non-invasive\, biocompatible label- free and enable trapping forces several orders of magnitudes larger than t heir optical counterparts at same actuation power\, hence preventing delet erious heating. Nevertheless\, while the ability to collect particles and cells at the nodes or antinodes of standing waves have been reported early on\, the design of selective acoustical tweezers able to pick up and mani pulate particles individually and in 3D has only been demonstrated recentl y. In this presentation\, we will show how flat\, miniaturized\, selective \, 3D acoustical tweezers can be designed with active holograms of specifi c wave structures called acoustical vortices. We will demonstrate their ca pabilities to trap and organize cells individually with efficiency (force over power ratio) two orders of magnitude larger than their optical counte rpart. Finally\, we will introduce some perspectives on multiple particles assembly\, 3D manipulation and ultra-high frequency acoustic tweezers. We will conclude this talk with a refreshing glimpse of how an acoustic sour ce could surf on its own acoustic wave\, paving the way toward acoustic qu antum analogues.\n\nReferences:\n[1] M. Baudoin\, J.-L. Thomas\, R.A. Sahe ly\, J.C. Gerbedoen\, Z. Gong\, A. Sivery\, O. Bou Matar\, N. Smagin\, A. Vlandas\, Spatially selective manipulation of cells with single beam acous tical tweezers\, Nature Commun.\,11: 4244 (2020)\n[2] M. Baudoin & J.L. Th omas\, Acoustic tweezers for particles and fluids micromanipulation\, Ann. Rev. Fluid Mech\, 52: 205-304 (2020)\n[3] M. Baudoin\, J.-C. Gerbedoen\, A. Riaud\, O. Bou Matar\, N. Smagin\, J.-L. Thomas\, “Folding a focalize d acoustical vortex on a flat holographic transducer: miniaturized selecti ve acoustical tweezer\,” Science Adv.: 5: eaav1967 (2019)\n[4] A. Riaud\ , M. Baudoin\, O.B. Matar\, J. L Thomas and P. Brunet\, On the influence o f viscosity and caustics on acoustic streaming in sessile droplets: an exp erimental and a numerical study with a cost-effective method\, J. Fluid Me ch.\, 821: 384-420 (2017)\, highlighted in «Focus on Fluids»\n[5] A. Rou x\, J.P. Martishang and M. Baudoin\, Self-radiation force on a moving mono polar source\, J. Fluid Mech.\, 952: A22 (2022)\n\nBiography: Pr. M. Baudo in started his research career at Sorbonne University\, where his PhD was dedicated to the linear and nonlinear propagation of acoustic waves in den se suspensions of microparticles. Then he joined the team of Pr. Baroud at LadHyx (Ecole Polytechnique) where he studied the dynamics of liquid plug s in microfluidic networks related to Pulmonary Obstructive Diseases. In 2 008 he started to build his own team at Université de Lille on\nsubjects at the interface between microfluidics\, acoustics and microsystems. In pa rticular he developed some selective holographic microtweezers able to man ipulate precisely individual cells and microorganisms and studied how the presence of partially wetting particles can drastically modify the interfa cial dynamics of fluids\, leading e.g. to “everlasting” bubbles. In 20 16 he became full Professor at University of Lille and was elected Junior Fellow of Institut\nUniversitaire de France in 2019. He also co-founded a startup\, Cleardrop\, on Surface Acoustic Wave (SAW)-mediated surface clea ning in 2021. LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418 https://epf l.zoom.us/j/64230566011 STATUS:CONFIRMED END:VEVENT END:VCALENDAR