Microelectrofluidic iris for variable aperture

Jong-hyeon Chang; Kyu-Dong Jung; Eunsung Lee; Minseog Choi; Seungwan Lee

doi:10.1117/12.906587

15 February 2012 Microelectrofluidic iris for variable aperture

Jong-hyeon Chang, Kyu-Dong Jung, Eunsung Lee, Minseog Choi, Seungwan Lee

Proceedings Volume 8252, MOEMS and Miniaturized Systems XI; 82520O (2012) https://doi.org/10.1117/12.906587
Event: SPIE MOEMS-MEMS, 2012, San Francisco, California, United States

Abstract

This paper presents a variable aperture design based on the microelectrofluidic technology which integrates electrowetting and microfluidics. The proposed microelectrofluidic iris (MEFI) consists of two immiscible fluids and two connected surface channels formed by three transparent plates and two spacers between them. In the initial state, the confined aqueous ring makes two fluidic interfaces, on which the Laplace pressure is same, in the hydrophobic surface channels. When a certain voltage is applied between the dielectric-coated control electrode beneath the three-phase contact line (TCL) and the reference electrode for grounding the aqueous, the contact angle changes on the activated control electrode. At high voltage over the threshold, the induced positive pressure difference makes the TCLs on the 1st channel advance to the center and the aperture narrow. If there is no potential difference between the control and reference electrodes, the pressure difference becomes negative. It makes the TCLs on the 1st channel recede and the aperture widen to the initial state. It is expected that the proposed MEFI is able to be widely used because of its fast response, circular aperture, digital operation, high aperture ratio, and possibility to be miniaturized for variable aperture.

Citation Download Citation

Jong-hyeon Chang, Kyu-Dong Jung, Eunsung Lee, Minseog Choi, and Seungwan Lee "Microelectrofluidic iris for variable aperture", Proc. SPIE 8252, MOEMS and Miniaturized Systems XI, 82520O (15 February 2012); https://doi.org/10.1117/12.906587

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