Nanoliter liquid refractive index sensing using a silica V-groove fiber interferometer

Quan Chai, Hyeonwoo Lee, Seongjin Hong, Yongsoo Lee, Junbum Park, Jianzhong Zhang, Kyunghwan Oh

Research output: Contribution to journalArticle

Abstract

A unique all-fiber interferometric sensor was proposed and successfully demonstrated efficient low-refractiveindex liquid sensing in the range from 1.33 to 1.37, which is compatible with those of bio-liquids. A special silica coreless optical fiber with an open V-groove was used as an optical sensing medium, which provided a high sensitivity for a minute liquid volume in the nanoliter scale. The V-groove fiber (VGF) was serially concatenated between two single-mode fibers (SMFs). The LP01 mode guided along the input SMF excited the higherorder modes in the VGF to generate multimode interference, whose spectrum was transmitted through the output SMF. A single liquid droplet with volume of ~80 nanoliters wet the entire hydrophilic surface of the VGF, and the transmission spectra shifted corresponding to its refractive index in a very linear manner. The sensor also showed a negligible temperature cross-sensitivity in the range 25°C-75°C, which overlaps with the biological temperature window such that the sensitivity of 159.696 nm per refractive index unit (nm/RIU) remained independent of the temperature variation. Modal properties of VGF were thoroughly analyzed numerically, and detailed processes for the sensor fabrication and sensing experiments were reported.

Original languageEnglish
Pages (from-to)792-797
Number of pages6
JournalPhotonics Research
Volume7
Issue number7
DOIs
Publication statusPublished - 2019 Jul

Fingerprint

V grooves
Silicon Dioxide
Interferometers
Refractive index
interferometers
Silica
refractivity
silicon dioxide
Single mode fibers
fibers
Fibers
Liquids
liquids
Sensors
sensors
Temperature
Optical fibers
sensitivity
Fabrication
temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Cite this

Chai, Quan ; Lee, Hyeonwoo ; Hong, Seongjin ; Lee, Yongsoo ; Park, Junbum ; Zhang, Jianzhong ; Oh, Kyunghwan. / Nanoliter liquid refractive index sensing using a silica V-groove fiber interferometer. In: Photonics Research. 2019 ; Vol. 7, No. 7. pp. 792-797.
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Nanoliter liquid refractive index sensing using a silica V-groove fiber interferometer. / Chai, Quan; Lee, Hyeonwoo; Hong, Seongjin; Lee, Yongsoo; Park, Junbum; Zhang, Jianzhong; Oh, Kyunghwan.

In: Photonics Research, Vol. 7, No. 7, 07.2019, p. 792-797.

Research output: Contribution to journalArticle

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