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Issue 4, 2013
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Inherent amplitude demodulation of an AC-EWOD (electrowetting on dielectric) droplet

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Recently, it has been shown that amplitude modulation (AM) in a wireless EWOD (electrowetting on dielectric) via magnetic induction facilitates the transmission of a low frequency message signal and then the oscillation of droplets at a low frequency. This process requires demodulation to recover the message signal from the high-frequency AM signal. As a key contribution, this paper theoretically and experimentally shows that the EWOD-actuated droplet has the inherent functionality of demodulation. That is, the EWOD droplet itself demodulates a supplied AM driving voltage, and as a result the contact angle of the droplet directly follows the message signal without any artificial demodulation circuit. A theoretical explanation of this inherent demodulation property is developed using a time-varying Lippmann–Young (LY) equation. In addition, experimental results are presented to substantiate the inherent demodulation functionality of an EWOD droplet.

Graphical abstract: Inherent amplitude demodulation of an AC-EWOD (electrowetting on dielectric) droplet

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Publication details

The article was received on 12 Sep 2012, accepted on 19 Nov 2012 and first published on 19 Nov 2012

Article type: Paper
DOI: 10.1039/C2LC41043E
Citation: Lab Chip, 2013,13, 662-668

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    Inherent amplitude demodulation of an AC-EWOD (electrowetting on dielectric) droplet

    M. G. Yoon, S. H. Byun and S. K. Cho, Lab Chip, 2013, 13, 662
    DOI: 10.1039/C2LC41043E

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