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Design and fabrication of hollow core slow light slot photonic crystal waveguides for nonlinear optics (Orale)

Abstract : We report our recent efforts for the design and fabrication of comb slot photonic crystal waveguides in silicon on insulator photonics. The main issues related to dispersion engineering, investigation of slow mode optical losses, and modal confinement metrics, have been investigated in various geometries. Nonlinear χ (3) optical properties have then been explored using a pump probe picosecond experiment and the obtained trends and results are discussed. OCIS codes: (130.5296) Photonic crystal waveguides, (130.4310) Nonlinear 1. Introduction Silicon photonics has received a strong interest in the last years, and the main efforts of the recent period have been focused on high-frequency active devices such as optical modulators and integrated detectors. To go beyond the data rates practically achievable using optoelectronic components and to reduce the energy ber bit of on-chip optical data transmissions, which appears to be a key metrics for future applications, an interesting opportunity is to exploit nonlinear optics to achieve all-optical signal processing. The main drawback of silicon is this purpose is the absence of second order nonlinear effects (χ (2)) and the strong free-carrier phenomena (Free Carrier Dispersion: FCR, Free Carrier Absorption) accompanying the Kerr effect when using χ (3)-processes. To address this issue and improve the functionality of photonic devices, the introduction of a slot in the silicon waveguide provides a way to confine light in the low index material due to the strong discontinuity at the index contrast interface [1]. Chosen according to its second and third order non-linear susceptibilities χ (2) and χ (3) , the low index material can dramatically enhance the non-linear effects in the photonic crystal waveguides. χ (2) electro-optic modulation [2] in slotted photonic crystals and χ (3) Four-Wave Mixing in slot waveguides [3] have been for example successfully demonstrated. But slotted waveguides can be also very useful for sensing thanks to the infiltration, because the analytes can interact with the extrema of the electric field, not only its evanescent part [4].
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Charles Caer, Xavier Le Roux, Jérémy Oden, Laurent Vivien, Nicolas Dubreuil, et al.. Design and fabrication of hollow core slow light slot photonic crystal waveguides for nonlinear optics (Orale). Asia Communications and Photonics Conference 2013, Nov 2013, Beijing, China. pp.AW4B.1, ⟨10.1364/ACPC.2013.AW4B.1⟩. ⟨hal-01689592⟩



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