2023
DOI: 10.1186/s43593-023-00049-z
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ISO-FLUCS: symmetrization of optofluidic manipulations in quasi-isothermal micro-environments

Abstract: Recently, it has been demonstrated that thermoviscous flows can be used for a range of fine micromanipulations, such as moving the cytoplasm of cells and developing embryos, intracellular rheology, and femtonewton-range force measurements. These flows, also known as focused-light-induced cytoplasmic streaming (FLUCS), are induced by mid-infrared laser scanning of a temperature spot through the sample. However, localized laser scanning can inflict temperature perturbations of several Kelvins on the sample, pote… Show more

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Cited by 14 publications
(5 citation statements)
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“…Simulations are conducted by integrating over the homocentric sphere with a radius 30 nm larger than the particle at the interface. The optical force can be balanced by a fluid drag force expressed as F drag = 6f D πηav, where η is the viscosity of liquid, v is the particle velocity, and f D is the drag coefficient depending on the viscosity ratio of upper and lower media [61], [62]. By approximately setting f D = 0.6 [61], the particle velocity is calculated [Fig.…”
Section: ⅲ Resultsmentioning
confidence: 99%
“…Simulations are conducted by integrating over the homocentric sphere with a radius 30 nm larger than the particle at the interface. The optical force can be balanced by a fluid drag force expressed as F drag = 6f D πηav, where η is the viscosity of liquid, v is the particle velocity, and f D is the drag coefficient depending on the viscosity ratio of upper and lower media [61], [62]. By approximately setting f D = 0.6 [61], the particle velocity is calculated [Fig.…”
Section: ⅲ Resultsmentioning
confidence: 99%
“…To apply these results to hydrodynamic simulations of scan path multiplexing, we follow the method presented in our recent study that used multiple scan paths to achieve net flows but with reduced time-averaged temperature gradients 39 .…”
Section: Methodsmentioning
confidence: 99%
“…As in previous work 39 , we may then obtain the net displacement of a tracer particle due to a scan path with arbitrary position and orientation by translating and rotating the result for the individual scan path obtained above. To leading order (i.e., assuming again ), the net displacement of a tracer due to sequential translation of the laser during multiplexing (i.e., multiple scan paths) is obtained as the sum of the net displacements due to each of the scan paths; the average velocity field of tracer particles is given by the total net displacement divided by the scan period.…”
Section: Methodsmentioning
confidence: 99%
“…[6][7][8][9][10][11] However, traditional optical tweezers require high laser power density and the spatial resolution is limited by diffraction. In the past decade, different approaches that cooperate with other fields such as plasmonics, [12] metamaterials, [13] electrophoresis, [14][15][16][17][18] optofluidics, [19][20][21][22][23][24][25] or thermophoresis [26,27] have redeemed the disadvantages of traditional optical tweezers and expanded the range of physical properties of the trappable nanoparticles.…”
Section: Introductionmentioning
confidence: 99%