Design considerations to realize differential absorption based optofluidic sensors for determination of ionic content in water

Gerrit W. Steen, Elmar C. Fuchs, Adam D. Wexler, Herman L. Offerhaus

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Integrated optofluidic absorption spectroscopy has the potential to be used in the real-time identification and quantification of ionic content in drinking water. Such an approach requires single mode operation in combination with low propagation and bend losses. The design criteria for the realization of an integrated Near-infrared (NIR) sensor platform fabricated using silicon waveguide based technology is presented. The cross-section of TriPleX waveguides was optimized for a spectral region between 940 and 1040nm. The waveguide structure provides single mode operation, high sensitivity combined with reasonable tolerance for fabrication deviations and <0.01 dB/cm bend losses for a radius of 500 μm. The optimum sensing length on chip was determined for propagation losses of 0.1 dB/cm, 0.5 dB/cm and 1.5 dB/cm. Furthermore, a Ξ coupler was designed for the spectral region of interest (0.94 to 1.04 μm). Multiple integrated photonic circuit layouts varying in functionality and complexity are reviewed. These optofluidic absorption sensors offer in-situ & in-line capabilities, potentially low-cost, remote signal data processing, and mechanical & thermal stability. This work provides a roadmap for maximizing the sensitivity of broadband spectroscopy using differential absorbance.

Original languageEnglish
Pages (from-to)6051-6058
Number of pages8
JournalIEEE sensors journal
Volume18
Issue number15
DOIs
Publication statusPublished - Aug 2018

Fingerprint

Waveguides
waveguides
sensors
Sensors
water
Integrated circuit layout
Water
drinking
propagation
sensitivity
Absorption spectroscopy
Potable water
layouts
Photonics
couplers
absorption spectroscopy
Thermodynamic stability
thermal stability
platforms
chips

Keywords

  • Absorption
  • Fluids
  • Integrated design
  • Integrated optics
  • Ions
  • Optical interferometry
  • Optical sensors
  • Optical waveguides
  • Optimization methods
  • Sensitivity
  • Silicon photonics
  • integrated design
  • optical sensors
  • optimization methods
  • optical interferometry
  • sensitivity
  • integrated optics
  • silicon photonics

Cite this

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title = "Design considerations to realize differential absorption based optofluidic sensors for determination of ionic content in water",
abstract = "Integrated optofluidic absorption spectroscopy has the potential to be used in the real-time identification and quantification of ionic content in drinking water. Such an approach requires single mode operation in combination with low propagation and bend losses. The design criteria for the realization of an integrated Near-infrared (NIR) sensor platform fabricated using silicon waveguide based technology is presented. The cross-section of TriPleX waveguides was optimized for a spectral region between 940 and 1040nm. The waveguide structure provides single mode operation, high sensitivity combined with reasonable tolerance for fabrication deviations and <0.01 dB/cm bend losses for a radius of 500 μm. The optimum sensing length on chip was determined for propagation losses of 0.1 dB/cm, 0.5 dB/cm and 1.5 dB/cm. Furthermore, a Ξ coupler was designed for the spectral region of interest (0.94 to 1.04 μm). Multiple integrated photonic circuit layouts varying in functionality and complexity are reviewed. These optofluidic absorption sensors offer in-situ & in-line capabilities, potentially low-cost, remote signal data processing, and mechanical & thermal stability. This work provides a roadmap for maximizing the sensitivity of broadband spectroscopy using differential absorbance.",
keywords = "Absorption, Fluids, Integrated design, Integrated optics, Ions, Optical interferometry, Optical sensors, Optical waveguides, Optimization methods, Sensitivity, Silicon photonics, integrated design, optical sensors, optimization methods, optical interferometry, sensitivity, integrated optics, silicon photonics",
author = "Steen, {Gerrit W.} and Fuchs, {Elmar C.} and Wexler, {Adam D.} and Offerhaus, {Herman L.}",
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Design considerations to realize differential absorption based optofluidic sensors for determination of ionic content in water. / Steen, Gerrit W.; Fuchs, Elmar C.; Wexler, Adam D.; Offerhaus, Herman L.

In: IEEE sensors journal, Vol. 18, No. 15, 08.2018, p. 6051-6058.

Research output: Contribution to journalArticleAcademicpeer-review

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