Title :
Two-layer waveguiding structure in LiNbO3 with birefringence reversal for refractive-index sensors with large measurement range
Author :
Hinkov, I. ; Hinkov, V.
Author_Institution :
Fraunhofer Inst. fuer Physikalische Messtechnik, Freiburg, Germany
fDate :
4/1/1993 12:00:00 AM
Abstract :
A two-layer structure in LiNbO3 fabricated by Ti-indiffusion and proton exchange has been developed and studied. This structure is especially suitable for constructing refractive-index sensors with a large measurement range. Besides its high sensitivity this structure offers some additional advantages, including the possibility of optimizing the sensitivity for a given measurand and the elimination of the necessity for buffer layers. The largely different sensitivities of the fundamental TE0- and TM0-modes achieved allows the measurement and the reference channel to be incorporated in the same waveguide. This allows a new type of polarization interferometry that increases the flexibility of the refractive-index sensor design
Keywords :
birefringence; integrated optics; light interferometry; light polarisation; lithium compounds; optical sensors; optical waveguides; refractometers; sensitivity; titanium; LiNbO3; LiNbO3:Ti; TM0-modes; Ti-indiffusion; birefringence reversal; buffer layers; fundamental TE0 modes; high sensitivity; large measurement range; polarization interferometry; proton exchange; reference channel; refractive-index sensors; two-layer structure; waveguiding structure; Biosensors; Birefringence; Buffer layers; Glass; Optical interferometry; Optical refraction; Optical sensors; Optical waveguides; Protons; Sensor phenomena and characterization;
Journal_Title :
Lightwave Technology, Journal of
