Low-concentration liquid sensing by an acoustic Mach-Zehnder interferometer in a two-dimensional phononic crystal

Aysevil Salman, Olgun Adem Kaya, Ahmet Cicek, Bulent Ulug

Araştırma sonucu: Dergi katkısıMakalebilirkişi

22 Alıntılar (Scopus)

Özet

Mach-Zehnder interferometer formed by liquid-filled linear defect waveguides in a twodimensional phononic crystal is numerically realized for sensing low concentrations of an analyte. The waveguides in the square phononic crystal of void cylinders in steel, as well as their T branches and sharp bends are utilized to construct interferometer arms. Sensing low concentrations of ethanol on the order of 0.1% in a binary mixture with water is achieved by replacing the contents of a number of waveguide core cells on one arm of the interferometer with the analyte. Computations are carried out through the finite-element method in an approach that takes the solid-liquid interaction at the waveguide core cells into account. Band analyses reveal linear variation of the central frequency of the transmission band within a band gap for ethanol concentrations up to 3.0%. Phase difference due to the imbalance of the sample and reference arms of the interferometer also varies linearly with ethanol concentration, leading in turn to a cosine variation of the Fourier component of the temporal interferometer response at the central input-pulse frequency. The induced phase difference in the investigated configuration becomes a -0.78π and -0.65π per percent increase of ethanol concentration as calculated from the band-structure and transient data, respectively. This is confirmed by transient finite-element simulations where totally destructive interference occurs for a concentration of approximately 1.5%. The proposed scheme, which can easily be adopted to other binary mixtures, offers a compact implementation requiring small amounts of analyte.

Orijinal dilİngilizce
Makale numarası255301
DergiJournal of Physics D: Applied Physics
Hacim48
Basın numarası25
DOI'lar
Yayın durumuYayınlanan - 1 Tem 2015
Harici olarak yayınlandıEvet

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