High-Sensitivity Metamaterial-Inspired Sensor for Microfluidic Dielectric Characterization
High-Sensitivity Metamaterial-Inspired Sensor for Microfluidic Dielectric Characterization
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DOI：
10.1109/jsen.2013.2295312
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发表时间：
2014-05-01
影响因子：
4.3
通讯作者：
Abbott, Derek
中科院分区：
文献类型：
--
作者：
Ebrahimi, Amir;Withayachumnankul, Withawat;Abbott, Derek
本文提出了一种新型超材料启发的微波微流体传感器。该器件的主要部分是微带耦合互补开环谐振器（CSRR）。谐振时，将沿着 CSRR 的侧面建立一个强电场，产生一个对附近介电材料变化非常敏感的区域。微通道位于该区域上方，用于微流体传感。通道内流动的液体样品会改变 CSRR 共振的共振频率和峰值衰减。液体样品的介电特性可以通过建立谐振特性和样品复介电常数之间的经验关系来估计。由于传感通道的横截面积比波长的平方小五个数量级以上，因此设计的微流体传感器需要非常少量的样品进行测试。所提出的微流体传感概念由于其紧凑性而与芯片实验室平台兼容。
A new metamaterial-inspired microwave microfluidic sensor is proposed in this paper. The main part of the device is a microstrip coupled complementary split-ring resonator (CSRR). At resonance, a strong electric field will be established along the sides of CSRR producing a very sensitive area to a change in the nearby dielectric material. A micro-channel is positioned over this area for microfluidic sensing. The liquid sample flowing inside the channel modifies the resonance frequency and peak attenuation of the CSRR resonance. The dielectric properties of the liquid sample can be estimated by establishing an empirical relation between the resonance characteristics and the sample complex permittivity. The designed microfluidic sensor requires a very small amount of sample for testing since the cross-sectional area of the sensing channel is over five orders of magnitude smaller than the square of the wavelength. The proposed microfluidic sensing concept is compatible with lab-on-a-chip platforms owing to its compactness.