Complementary Split-Ring Resonator for Microwave Heating of µL Volumes in Microwells in Continuous Microfluidics

This work presents the design and evaluation of a planar device for microwave heating liquids in continuous microfluidics (CMF) made polydimethylsiloxane (PDMS). It deals with volumes µL range, which are high interest relevance to biologists chemists. The heater this is conceived around complementary split-ring resonator (CSRR) topology that offers desired electric field direction to—and interaction with—liquids microwell. designed on 0.25 mm thick Rogers RO4350B substrate operates at 2.5 GHz, while CMF channel 2.45 microwell manufactured PDMS using casting process. performance conducted fluorescent dye, Rhodamine B, dissolved deionized water. Heating measurements carried out 1 W power achieves temperature 47 °C sample volume after 20 s heating. Based achieved results, CSRR has large potential heating, addition already demonstrated dielectric sensing, all proving multifunctionality reusability single microwave-microfluidic devices.