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Author: search.filters.author.Jaruwongrungsee, KataSubject: search.filters.subject.Metamaterial

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    Item type:Publication,
    Metamaterial-based microfluidic sensor for dielectric characterization
    (2013-01-01)
    Withayachumnankul, Withawat
    ;
    Jaruwongrungsee, Kata
    ;
    Tuantranont, Adisorn
    ;
    Fumeaux, Christophe
    ;
    Abbott, Derek
    A microfluidic sensor is implemented from a single split-ring resonator (SRR), a fundamental building block of electromagnetic metamaterials. At resonance, an SRR establishes an intense electric field confined within a deeply subwavelength region. Liquid flowing in a micro-channel laid on this region can alter the local field distribution and hence affect the SRR resonance behavior. Specifically, the resonance frequency and bandwidth are influenced by the complex dielectric permittivity of the liquid sample. The empirical relation between the sensor resonance and the sample permittivity can be established, and from this relation, the complex permittivity of liquid samples can be estimated. The technique is capable of sensing liquid flowing in the channel with a cross-sectional area as small as (0.001λ<inf>0</inf>)<sup>2</sup>, where λ<inf>0</inf> denotes the free-space wavelength of the wave excitation. This work motivates the use of SRR-based microfluidic sensors for identification, classification, and characterization of chemical and biochemical analytes. © 2012 Elsevier B.V.
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    Metamaterial-inspired multichannel thin-film sensor
    (2012-04-24)
    Withayachumnankul, Withawat
    ;
    Jaruwongrungsee, Kata
    ;
    Fumeaux, Christophe
    ;
    Abbott, Derek
    A multichannel thin-film sensor is implemented from a set of microstrip-coupled split-ring resonators (SRRs) with different dimensions. Each SRR exhibits a unique high-Q resonance that is sensitive to the presence of a sample in a particular area. Hence, this SRR-based sensor can function (i) to detect different samples simultaneously to increase the throughput or (ii) to characterise nominally identical samples at multiple frequencies to increase the sensor selectivity. In addition, the sensitivity of this SRR-based sensor is optimized through strategic design of the resonator shape to produce a strong confined electric field at each sensing region. The design principle is validated with simulation and measurement. Owing to the optimized design, sensing a low-permittivity film with a thickness as small as one thousandth of the operating wavelength is achievable. © 2012 IEEE.