A compact optical chip for refractive sensing based on cut-off enhanced modal coupling changes

Joris Van Lith, Hugo J.W.M. Hoekstra, Fehmi Çivitci, Remco Stoffer, Paul V. Lambeck

Research output: Contribution to journalArticlepeer-review


A novel type of integrated optical sensor has been evaluated theoretically. The sensing is based on the large effect of the refractive index of the measurand (generally a liquid) to the mode profile of a guided mode close to the cut-off. A special type turns over into a leaky mode-based sensor. The sensor has small size and is simple to fabricate. For the SiON technology-based structures used as a vehicle for the evaluation, a resolution of the refractive index in the range of 10-6 RIU has been achieved; however, with an operation range around a certain working index of ≈2 × 10-4 RIU only. This working index can be shifted to any desired value, within a certain range, by appropriately choosing the geometrical and material parameters. Because of technological tolerances, for practical operation, read-out based on wavelength scanning is required. The sensor can be used especially as an alarming sensor.

Original languageEnglish (US)
Pages (from-to)111-119
Number of pages9
JournalSensors and Actuators, B: Chemical
StatePublished - Dec 15 2014
Externally publishedYes


  • Guided-wave optics
  • Integrated optics
  • Segmented waveguides
  • Sensing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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