Double polarization active Y-junctions in the mid-IR, based on Ti:diffused lithium niobate waveguides: first results on photonic crystal structures

Samuel Heidmann; Clément Guyot; Gwenn Ulliac; Nadège Courjal; Guillermo Martin

doi:10.1117/12.979670

12 September 2012 Double polarization active Y-junctions in the mid-IR, based on Ti:diffused lithium niobate waveguides: first results on photonic crystal structures

Samuel Heidmann, Clément Guyot, Gwenn Ulliac, Nadège Courjal, Guillermo Martin

Author Affiliations +

Proceedings Volume 8445, Optical and Infrared Interferometry III; 84453B (2012) https://doi.org/10.1117/12.979670
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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.

Citation Download Citation

Samuel Heidmann, Clément Guyot, Gwenn Ulliac, Nadège Courjal, and Guillermo Martin "Double polarization active Y-junctions in the mid-IR, based on Ti:diffused lithium niobate waveguides: first results on photonic crystal structures", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84453B (12 September 2012); https://doi.org/10.1117/12.979670

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