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This paper reports on a 4 GHz microwave droplet heater for digital microfluidics. The uniplanar device was fabricated using a gold-on-quartz process and was optimized for uniform heating within a 1 μL droplet. Microwave measurements show excellent agreement with COMSOL simulations. The uniformity of the induced temperature within the droplet was experimentally validated using fluorescence microscopy...
This paper presents a novel coplanar waveguide transmission line microwave heater, realized on a high-resistivity silicon wafer with etched microfluidic channels that is bonded to a glass wafer. The heater is a 50 Ohm line with variable attenuation constant along the length of the line. This design results in a uniform energy dissipation in water filled channels, and obviates the need for additional...
This paper proposes an optimized microwave heater at 20 GHz for nanoliter scale liquid samples in digital microfluidics. The developed measurement setup allows translating of the reflection coefficient of the heater to the temperature change of the water droplet via the temperature dependency of the liquid permittivity, thus avoiding a contact-based temperature measurement. Measurements have been...
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