New optical detection techniques for chemical sensors

Sergio B. Mendes, Seppo Honkanen, Mahmoud Fallahi, Nasser Peyghambarian

Research output: Contribution to journalConference articlepeer-review


In this work we present three novel optical approaches towards the implementation of bio- and chemical sensors. First we describe an absorbance spectroscopic technique developed on a waveguide platform that features a sensitivity enhancement of 4 orders of magnitude compared to the conventional transmission measurements of ultra-thin films. Next we show a waveguide Zeeman interferometric technique, which is based on the relative phase change between the TE and TM waveguide modes, applied as a sensor platform. Finally an external-cavity laser, a semiconductor laser combined with a single mode optical fiber and a Bragg grating reflector, was built to work as an active sensor where the analyte species were incorporated inside the resonant cavity to increase sensitivity.

Original languageEnglish (US)
Pages (from-to)42-49
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1998
EventMethods for Ultrasensitive Detection - San Jose, CA, United States
Duration: Jan 26 1998Jan 28 1998


  • Evanescent wave
  • Integrated optics
  • Optical fiber
  • Semiconductor laser
  • Sensor
  • Waveguide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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