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Title of Journal: Appl Phys B

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Abbravation: Applied Physics B

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Springer-Verlag

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DOI

10.1007/s11015-007-0122-1

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1432-0649

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Grating coupled interferometry for optical sensing

Authors: Peter Kozma Andras Hamori Kaspar Cottier Sandor Kurunczi Robert Horvath
Publish Date: 2009/08/20
Volume: 97, Issue: 1, Pages: 5-8
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Abstract

An interferometric sensor based on gratings on a planar waveguide is introduced The device combines the advantages of known interferencebased 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

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