Integrated LiNbO3 photonic crystals

Nadège Courjal; Clément Guyot; Gwenn Ulliac; Arnaud Gerthoffer; Fabien Henrot; Wentao Qiu; Fadi Baida; Maria-Pilar Bernal

doi:10.1117/12.2037606

8 March 2014 Integrated LiNbO₃ photonic crystals

Nadège Courjal, Clément Guyot, Gwenn Ulliac, Arnaud Gerthoffer, Fabien Henrot, Wentao Qiu, Fadi Baida, Maria-Pilar Bernal

Author Affiliations +

Proceedings Volume 8988, Integrated Optics: Devices, Materials, and Technologies XVIII; 898810 (2014) https://doi.org/10.1117/12.2037606
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

We present easy-to-implement technologies to produce LiNbO3 PhCs in confined optical waveguides. Ti-indiffusion or Annealed Proton Exchange (APE) are combined with optical grade dicing to fabricate ridge waveguides with propagation losses that can be lower than 0.2 dB/cm. Firstly we show how a PhC inscribed in a confined ridge waveguide can be exploited as a temperature sensor with an unexpectedly high 8 nm/°C temperature sensitivity. LiNbO3 PhCs with high aspect ratio are also demonstrated. The performance is achieved by properly tilting the ridge before patterning its walls by Focused Ion Beam (FIB). A eight micrometer long 1D-PhC on a Ti:LiNbO₃ ridge waveguide has been fabricated and its reflectivity has been evaluated using an optical coherence tomography (OCT) system: it is measured to be 53 % for the TM wave and 47 % for the TE wave. The period can be optimized in order to increase the reflection of the 1D-PhC up to 80 %. These developments open the way to the dense integration of compact dynamic devices such as modulators, spectral filters or electric field sensors.

Citation Download Citation

Nadège Courjal, Clément Guyot, Gwenn Ulliac, Arnaud Gerthoffer, Fabien Henrot, Wentao Qiu, Fadi Baida, and Maria-Pilar Bernal "Integrated LiNbO₃ photonic crystals", Proc. SPIE 8988, Integrated Optics: Devices, Materials, and Technologies XVIII, 898810 (8 March 2014); https://doi.org/10.1117/12.2037606

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