Applied Physics B

, Volume 97, Issue 1, pp 5–8

Grating coupled interferometry for optical sensing

  • Peter Kozma
  • Andras Hamori
  • Kaspar Cottier
  • Sandor Kurunczi
  • Robert Horvath
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DOI: 10.1007/s00340-009-3719-1

Cite this article as:
Kozma, P., Hamori, A., Cottier, K. et al. Appl. Phys. B (2009) 97: 5. doi:10.1007/s00340-009-3719-1

Abstract

An interferometric sensor based on gratings on a planar waveguide is introduced. The device combines the advantages of known interference-based waveguide sensors with the simplicity of grating couplers. In the presented configuration, two parallel and coherent light beams, laterally separated in the direction of mode propagation, are coupled into a planar waveguide through a grating. One of the coupled beams is phase modulated using a periodically relaxing liquid crystal modulator, resulting in a time varying intensity signal at the end face of the waveguide. Refractive index changes within the waveguide section between the two coupling regions are monitored by observing characteristic changes in the intensity signal.

PACS

42.79 07.60 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Peter Kozma
    • 1
  • Andras Hamori
    • 1
  • Kaspar Cottier
    • 2
  • Sandor Kurunczi
    • 1
  • Robert Horvath
    • 1
  1. 1.Photonics DepartmentResearch Institute for Technical Physics and Materials ScienceBudapestHungary
  2. 2.Creoptix GmbHWädenswilSwitzerland

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