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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
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Waveguide-based absorption measurement system for visible wavelength applications.

P Neutens1, R Jansen1, G Woronoff1

  • 1Imec, Kapeldreef 75, 3001 Leuven, Belgium.

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|May 17, 2021
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Summary
This summary is machine-generated.

We developed a miniaturized, silicon nitride photonic chip for measuring dye concentration using light absorption. This lab-on-chip system offers accurate, camera-based detection for various applications.

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Area of Science:

  • Photonics
  • Integrated Optics
  • Biomedical Engineering

Background:

  • Lab-on-chip devices require sensitive and miniaturized detection systems.
  • Absorption-based measurements are a common technique for analyte quantification.

Purpose of the Study:

  • To present a miniaturized waveguide-based absorption measurement system.
  • To demonstrate its suitability for lab-on-chip applications.
  • To establish a correlation between dye concentration and absorption loss.

Main Methods:

  • Utilized a silicon nitride integrated photonic platform operating at 635 nm.
  • Experimentally correlated bulk dye concentration with waveguide absorption loss.
  • Developed a photonic design process for optimizing waveguide selection.
  • Implemented a camera readout for multiple measurements.

Main Results:

  • Achieved a high correlation between bulk dye concentration and measured absorption loss.
  • Demonstrated the effectiveness of the photonic design process in minimizing concentration variation.
  • Showcased the system's compatibility with camera readout and lab-on-chip integration.

Conclusions:

  • The miniaturized waveguide system is a viable solution for lab-on-chip absorption measurements.
  • The developed photonic design process enhances measurement accuracy.
  • The camera-based readout facilitates integration and multiplexing in cartridge-based systems.