Biosensing configurations using guided wave resonant structures

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

27 Scopus citations

Abstract

Resonant structures are characterized by a high quality factor representing the sensitivity to perturbations in a cavity. In guided wave resonant structures the optical field is evanescent, forming a region where the resonance can be modified by externally varying the refractive index within this evanescence region. The resonance nature of these structures then allows high sensitivity to analytes, gases, or other external index perturbations down to the order of 10-8 RIU. In this article several configurations of guided wave resonant structures and their use for sensing are reviewed with special emphasis on grating coupled resonant structures. The sensor performance is discussed using analytic approaches based on planar waveguide sensors theory and using the 4 × 4 characteristic matrix approaches for multilayered structure and with homogenized grating treated as a uniaxial thin film. The results agree very well with experiment and with rigorous electromagnetic calculations even when the cover is anisotropic medium such as a liquid crystal that can be used for tunable filtering or temperature sensing.

Original languageEnglish
Title of host publicationOptical Waveguide Sensing and Imaging
PublisherSpringer Verlag
Pages211-228
Number of pages18
ISBN (Print)9781402069505
DOIs
StatePublished - 1 Jan 2008

Publication series

NameNATO Science for Peace and Security Series B: Physics and Biophysics
ISSN (Print)1874-6500

Keywords

  • Biosensors
  • Gratings
  • Guided wave resonance
  • Microresonators
  • Optical sensors
  • Resonant mirror
  • Tunable filters
  • Waveguides

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