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Proceedings Paper

Polarization-independent grating coupling in planar waveguide using photoinduced birefringence
Author(s): Donald Peyrot; Tigran V. Galstian; Roger A. Lessard
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Paper Abstract

The effective refractive index of a guided wave depends on its polarization due to the anisotropic phase shift during the total internal reflection. Thus the grating-coupling angle is in general different for TM and TE polarized light. The compensation of this anisotropy is a difficult task. Some optical materials may present a significant birefringence when exposed to a polarized light. We would like to compensate the optical anisotropy using this photo-induced birefringence phenomenon, which would allow us to bring back the TM grating-coupling angle to the TE one. During these studies, we have developed an optical material, which allows us the formation of a relief grating via traditional light exposure techniques. At the same time, this material exhibits a significant photo-induced birefringence. This takes place thanks to the molecular reorientation phenomena after that the recording of the grating coupler is over. It is important to note that this last process does not affect significantly the grating-coupler. Furthermore we have observed that photo-induced birefringence present a strong reminiscence after the pump beam deactivation. The grating coupling experiments with and without the photo-induced phenomena were conducted.

Paper Details

Date Published: 17 February 2003
PDF: 8 pages
Proc. SPIE 4833, Applications of Photonic Technology 5, (17 February 2003); doi: 10.1117/12.473826
Show Author Affiliations
Donald Peyrot, COPL, Laval Univ. (Canada)
Tigran V. Galstian, COPL, Laval Univ. (Canada)
Roger A. Lessard, COPL, Laval Univ. (Canada)

Published in SPIE Proceedings Vol. 4833:
Applications of Photonic Technology 5

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