Paper
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
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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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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KEYWORDS
Photonic crystals

Polarization

Modulation

Waveguides

Electro optics

Mid-IR

Dispersion

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