[Journal of Applied Science]Meta-atom microfluidic sensor for measurement of dielectric properties o
High sensitivity microwave frequency microfluidic sensing is gaining popularity in chemical and biosensing applications for evaluating the dielectric properties of liquid samples. Here, we show that a tiny microfluidic channel positioned in the gaps of a dual-gap meta-atom split-ring resonator can exploit the electric field sensitivity to predict the dielectric properties of liquid samples. Employing an empirical relation between resonant characteristics of the fabricated sensor and the complex permittivity of water-ethanol or water-methanol mixtures produces good congruence to standardized values from the literature. This microfluidic sensor offers a potential lab-on-chip solution for liquid dielectric characterization without external electrical connections.
Robiatun A. Awang1,2,3,a), Francisco J. Tovar-Lopez1,4, Thomas Baum1, Sharath Sriram1,2,4, and Wayne S. T. Rowe1,a) 1School of Engineering, RMIT University, Melbourne, Australia 2Functional Materials and Microsystems Research Group, RMIT University, Melbourne, Australia 3Faculty of Electrical Engineering, Universiti Teknologi MARA, Shah Alam, Selangor, Malaysia 4Micro Nano Research Facility, RMIT University, Melbourne, Australia a)Electronic addresses: firstname.lastname@example.org and email@example.com
Journal of Applied Physics 121, 094506 (2017); doi: http://dx.doi.org/10.1063/1.4978012