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

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 th...

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Bibliographic Details
Published in:Lab on a chip 2013-02, Vol.13 (4), p.662-668
Main Authors: Yoon, Myung Gon, Byun, Sang Hyun, Cho, Sung Kwon
Format: Article
Language:English
Subjects:
Demodulation
Dielectrics
Droplets
Electric Stimulation
Electrowetting
Low frequencies
Magnetic Fields
Mathematical analysis
Messages
Particle Size
Signal processing
Voltage
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Summary: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. An EWOD droplet has an inherent demodulation functionality that extracts the envelope signal from an AM (amplitude modulated) input voltage and expresses its form in the contact angle.
ISSN:1473-0197
1473-0189
DOI:10.1039/c2lc41043e