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Proceedings Paper

Double polarization active Y-junctions in the mid-IR, based on Ti:diffused lithium niobate waveguides: first results on photonic crystal structures
Author(s): Samuel Heidmann; Clément Guyot; Gwenn Ulliac; Nadège Courjal; Guillermo Martin
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Paper Abstract

We present our work on integrated optic beam combiners devoted to mid-infrared applications in the field of stellar interferometry, in particular for nulling interferometry, where high rejection ratios are needed. The main results obtained are the single-mode behavior of the waveguides at a central wavelength λ=3.39μm, in both TE and TM polarization, a high rejection ratio on the modulated signal (best value of 30dB) and low dispersion in wide-band configuration. In a second time, in order to improve the electro-optic response of the modulators, we have realized a photonic crystal inside one of the arms of the Y-junction. Theoretical results predict simultaneous TE and TM group index enhancement, which should give better electro-optic response, however, our preliminary experimental results do not show significant difference with the initial combiners. Perspectives on the future work will be presented.

Paper Details

Date Published: 12 September 2012
PDF: 7 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84453B (12 September 2012); doi: 10.1117/12.979670
Show Author Affiliations
Samuel Heidmann, UJF-Grenoble 1, CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (France)
Clément Guyot, Univ. de Franche-Comté, FEMTO-ST (France)
Gwenn Ulliac, Univ. de Franche-Comté, FEMTO-ST (France)
Nadège Courjal, Univ. de Franche-Comté, FEMTO-ST (France)
Guillermo Martin, UJF-Grenoble 1, CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (France)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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