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A tunable optofluidic lens based on combined effect of hydrodynamics and electroosmosis

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A tunable optofluidic lens based on combined effect of hydrodynamics and electroosmosis

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dc.contributor.author Li, Haiwang
dc.contributor.author Wong, Teck Neng
dc.contributor.author Nguyen, Nam-Trung
dc.date.accessioned 2012-04-12T03:28:50Z
dc.date.available 2012-04-12T03:28:50Z
dc.date.copyright 2010
dc.date.issued 2012-04-12
dc.identifier.citation Li, H., Wong, T. N. & Nguyen, N. T. (2011). A tunable optofluidic lens based on combined effect of hydrodynamics and electroosmosis. Microfluidics and Nanofluidics, 10(5), 1033-1043.
dc.identifier.uri http://hdl.handle.net/10220/7743
dc.description.abstract This paper presents the modeling and experimental results of a liquid-core liquid-cladding optofluidic lens under the combined effect of hydrodynamics and electroosmosis. To allow the lens to be tuned by a voltage, the cladding fluids are electrically conducting, while the core fluid is non-conducting. Under constant flow rates, mathematical models of two-dimensional dipole flow in a circularly bounded domain and electric field outside the parallel-plate capacitor were used to predict the curvature of the interface. A test device with a circular lens chamber with 2 mm diameter and 250 μm height was fabricated in polymethylmethacrylate (PMMA) using thermal bounding method. Two cladding fluids (aqueous NaCl) and the core fluid (silicone oil) are introduced into the circular domain by syringe pumps. External electric fields are applied on the two cladding fluids. Under the same inlet volumetric flow rates, the applied voltages are varied to tune the curvature of the interfaces between the cladding fluids and the core fluid. The interface shape is measured using fluorescence imaging technique. The results show that the interfaces between the cladding fluids and the core fluid have optically smooth arc shape. Under fixed cladding flow rates, the same voltage forms symmetric biconvex lens only. Different voltages can form biconvex lens, plano-convex lens, and meniscus lens. The experimental results agree well with the presented analytical model.
dc.language.iso en
dc.relation.ispartofseries Microfluidics and nanofluidics
dc.rights © 2012 Springer-Verlag. This is the author created version of a work that has been peer reviewed and accepted for publication by Microfluidics and nanofluidics, Springer-Verlag. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: http://dx.doi.org/10.1007/s10404-010-0732-y.
dc.subject DRNTU::Engineering::Mechanical engineering.
dc.title A tunable optofluidic lens based on combined effect of hydrodynamics and electroosmosis
dc.type Journal Article
dc.contributor.school School of Mechanical and Aerospace Engineering
dc.identifier.doi http://dx.doi.org/10.1007/s10404-010-0732-y
dc.identifier.rims 159432

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