Optoelectronic reconfigurable microchannels

Haulot, Gauvain; Benahmed, Arnaud; Ho, CM

doi:10.1109/memsys.2011.5734360

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…Smaller feature sizes can be achieved by improving the resolution of OEH devices and reducing the frozen material layer's thickness. Thawing of a frozen media by OEH paves the way to the rapid fabrication and reconfiguration of microfluidic structures, as previously reported [19]. This work provides a quantitative analysis of the OEH process for further investigation of reconfigurable microfluidic circuitry controlled by lowpower light images.…”

Section: Resultssupporting

confidence: 61%

“…Optoelectronic heating (OEH) constitutes a new technique for thermal control at the microscale. OEH provides high flexibility in thermal operations and is of particular interest for microfluidic applications, especially in the area of phase-transition-based flow control [19]. This paper reports on the fabrication and characterization of newly developed optoelectronic heaters (OEH devices).…”

Section: Introductionmentioning

confidence: 99%

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Optoelectronic Heating for Fabricating Microfluidic Circuitry

Haulot

2011

Advances in OptoElectronics

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This work reports on optoelectronic-based heaters that can transduce low-power optical images into high-power heating to melt frozen liquids and form desired microfluidic circuitry. The mechanism of optoelectronic heating (OEH) was studied and characterized. OEH relies on photocurrent heating in the illuminated parts of actuating images. Resolution was affected by dark current heating. Photocurrents and dark currents were measured and related to the operating parameters. Successful melting of a frozen media within seconds with 2 mW light patterns and a 4 V operating voltage was demonstrated with feature sizes down to 200 μm × 200 μm. Strategies to increase resolution were addressed. It was shown that the size and location of heating areas can be reliably and rapidly reconfigured by changing the actuating image.

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Section: Resultssupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Optoelectronic Heating for Fabricating Microfluidic Circuitry

Haulot

2011

Advances in OptoElectronics

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“…16 Its growing developments have been utilized for various engineering and biological applications. [16][17][18][19][20][21][22][23][24] However, several limitations exist in these designs for microparticle manipulations. For example, the requirement of high N.A.…”

Section: Introductionmentioning

confidence: 99%

Cell patterning via diffraction-induced optoelectronic dielectrophoresis force on an organic photoconductive chip

et al. 2013

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A laser diffraction-induced dielectrophoresis (DEP) phenomenon for the patterning and manipulation of individual HepG2 cells and polystyrene beads via positive/negative DEP forces is reported in this paper. The optoelectronic substrate was fabricated using an organic photoconductive material, TiOPc, via a spin-coating process on an indium tin oxide glass surface. A piece of square aperture array grid grating was utilized to transform the collimating He-Ne laser beam into the multi-spot diffraction pattern which forms the virtual electrodes as the TiOPc-coating surface was illuminated by the multi-spot diffraction light pattern. HepG2 cells were trapped at the spot centers and polystyrene beads were trapped within the dim region of the illuminated image. The simulation results of light-induced electric field and a Fresnel diffraction image illustrated the distribution of trapped microparticles. The HepG2 morphology change, adhesion, and growth during a 5-day culture period demonstrated the cell viability through our manipulation. The power density inducing DEP phenomena, the characteristics of the thin TiOPc coating layer, the operating ac voltage/frequency, the sandwiched medium, the temperature rise due to the ac electric fields and the illuminating patterns are discussed in this paper. This concept of utilizing laser diffraction images to generate virtual electrodes on our TiOPc-based optoelectronic DEP chip extends the applications of optoelectronic dielectrophoretic manipulation.

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