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An electrokinetically tunable optofluidic bi-concave lens

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An electrokinetically tunable optofluidic bi-concave lens

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dc.contributor.author Li, Haiwang
dc.contributor.author Song, Chaolong
dc.contributor.author Luong, Trung-Dung
dc.contributor.author Nguyen, Nam-Trung
dc.contributor.author Wong, Teck Neng
dc.date.accessioned 2012-07-30T05:53:40Z
dc.date.available 2012-07-30T05:53:40Z
dc.date.copyright 2012
dc.date.issued 2012-07-30
dc.identifier.citation Li, H., Song, C., Luong, T. D., Nguyen, N.-T., & Wong, T. N. (2012). An electrokinetically tunable optofluidic bi-concave lens. Lab on a Chip.
dc.identifier.uri http://hdl.handle.net/10220/8351
dc.description.abstract This paper numerically and experimentally investigates and demonstrates the design of an optofluidic in-plane bi-concave lens to perform both light focusing and diverging using the combined effect of pressure driven flow and electro-osmosis. The concave lens is formed in a rectangular chamber with a liquid core-liquid cladding (L2) configuration. Under constant flow rates, the performance of the lens can be controlled by an external electric field. The lens consists of a core stream (conducting fluid), cladding streams (non-conducing fluids), and auxiliary cladding streams (conducting fluids). In the focusing mode, the auxiliary cladding stream is introduced to sandwich the biconcave lens to prevent light rays from scattering at the rough chamber wall. In the diverging mode, the auxiliary cladding liquid has a new role as the low refractive-index cladding of the lens. In the experiments, the test devices were fabricated in polydimethylsiloxane (PDMS) using the standard soft lithography technique. Ethanol, cinnamaldehyde, and a mixture of 73.5% ethylene glycol and 26.5% ethanol work as the core stream, cladding streams and auxiliary cladding streams. In the numerical simulation, the electric force acts as a body force. The governing equations are solved by a finite volume method on a Cartesian fixed staggered grid. The evolution of the interface was captured by the level set method. The results show that the focal length in the focusing mode and the divergent angle of the light beam in the diverging mode can be tuned by adjusting the external electric field at fixed flow rates. The numerical results have a reasonable agreement with the experimental results.
dc.language.iso en
dc.relation.ispartofseries Lab on a chip
dc.rights © 2012 The Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Lab on a Chip, The Royal Society of Chemistry. 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: [DOI: http://dx.doi.org/10.1039/C2LC40406K].
dc.subject DRNTU::Engineering::Mechanical engineering.
dc.title An electrokinetically tunable optofluidic bi-concave lens
dc.type Journal Article
dc.contributor.school School of Mechanical and Aerospace Engineering
dc.identifier.doi http://dx.doi.org/10.1039/C2LC40406K
dc.description.version Accepted version
dc.identifier.rims 167504

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