All?fiber microfluidic multimode Mach–Zehnder interferometers as high sensitivity refractive index sensors

in Sciences Citation Index(SCI), 科學引文索引資料庫(SCI)
標題All?fiber microfluidic multimode Mach–Zehnder interferometers as high sensitivity refractive index sensors
出版類型SCI(Sciences Citation Index)
出版年度2017
AuthorsChien-Hsing Chen, 陳建興, Wei Te Wu(Benny) 吳瑋特, & Jian-Neng Wang 王劍能
開始頁429
頁數11
出版日期2018 / 1
其他編號0000
中文摘要

We present microfluidic multimode fiber Mach–Zehnder interferometers (MMF-MZIs),
suitable for refractive index (RI) measurement. The compact and low-cost all-fiber
MMF-MZIs were made by forming two coupling points in series at a localized short
section (about 1–5 cm) of a multimode optical fiber, using an electric-arc system, thus
allowing the excitation and recombination of core and cladding modes. The MMF-MZIs
have been integrated with a home-made microfluidic chip, used as a high sensitivity RI
sensor to ascertain the surrounding RI variations. This type of microfluidic lab-on-a-chip
MZI-based sensor was shown to be effective in sensing very small quantities of samples
and its transmitted light signal could easily be measured. The spectra of all MMF-MZIs
were Fourier transformed to obtain and the spatial frequency spectra. The MMF-MZIs
exhibited many dominant spatial frequencies for all interferometer lengths and
interference was mainly constructed by the core mode and dominant lower order
cladding modes when the sensing length was 2–5 cm as well as distributed by the core
mode and dominant higher order cladding modes when the sensing length was 1 cm. The
transmitted spectra of the MMF-MZIs exhibited various sinusoidal-like interference
fringes’ amplitudes and peaks changed differently by immersing the MMF-MZIs in
different concentrations of sucrose solutions. The microfluidic MMF-MZI sensors have a
high resolution of 3.1 × 10?5 to 7.5 × 10?5 RIU and a high sensitivity of 160–347
dBm/RIU within RI range from 1.333 to 1.370.

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期刊名稱Microsystem Technologies
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