Optical sensors based on palladium and polymer-coated optical fiber resonators

Bavili N., Eryurek M., Morova B., Yilgor I., Yilgor E., Kiraz A.

Conference on Optical Sensors, Prague, Czech Republic, 1 - 04 April 2019, vol.11028 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 11028
  • Doi Number: 10.1117/12.2524939
  • City: Prague
  • Country: Czech Republic
  • Keywords: Fiber resonator, WGM, fiber tapering, optical sensor
  • Istanbul Technical University Affiliated: No


In this work, we present robust and easy-to-fabricate optical gas and vapor sensors based on optical fiber resonators (OFR) coated with palladium (Pd) thin films, Pd micro-particles and polymer brushes (PB). Pd based sensors are used for hydrogen (H-2) gas detection in concentration range of 0% to 1% and polymer brush-coated OFR are used for detection of vapor in concentration range of 0 to 25%. Sensing mechanism of these sensors is based on spectral shift of resonance wavelength which are called whispering gallery modes (WGMs). This spectral shift is due to volume expansion of the sensing material. Tapered fiber is used in order to excite WGMs in coated OFRs. Good sensitivity and repeatability results are obtained for all three types of sensors.