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Mode selection and dispersion engineering in Bragg-like slot photonic crystal waveguides for hybrid light–matter interactions

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Abstract

We introduce a family of slot photonic crystal waveguides (SPhCWs) for the hybrid integration of low-index active materials in silicon photonics with energy-confinement factors of ~30% in low-index regions. The proposed approach, which is based on a periodic indentation of the etched slot in the middle of the SPhCW, makes it possible to reconcile a simultaneously narrow and wide slot for exploiting the two modes of even symmetry of a SPhCW. The resulting mode-selection mechanism allows a flexible choice of the modes to be used. Furthermore, the proposed structure offers tremendous flexibility for adjusting the dispersive properties of the slot-confined modes, in particular of their slow-light effects. Flat band slow light in a bandwidth of about 60 nm with a group velocity dispersion factor |β2| below 1 ps2/mm is numerically demonstrated by this approach, corresponding to a normalized delay bandwidth product of around 0.4. These results, obtained from hollow-core periodic waveguides that are directly designed in view of hybrid integration of active materials in mechanically robust structures (not based on free-standing membranes) could pave the way for the realization of on-chip slow-light bio-sensing, active hybrid-silicon optoelectronic devices, or all-optical hybrid-silicon nonlinear functionalities.

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DOI:10.1364/prj.6.000054

收稿日期:2017-07-04

录用日期:2017-11-21

网络出版日期:2017-11-21

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Samuel Serna:Centre de Nanosciences et de Nanotechnologies, UMR 9001 (CNRS/Université Paris-Sud), Université Paris-Saclay, 91405 Orsay, France
Weiwei Zhang:Centre de Nanosciences et de Nanotechnologies, UMR 9001 (CNRS/Université Paris-Sud), Université Paris-Saclay, 91405 Orsay, France
Thi Hong Cam Hoang:Centre de Nanosciences et de Nanotechnologies, UMR 9001 (CNRS/Université Paris-Sud), Université Paris-Saclay, 91405 Orsay, France
Carlos Alonso-Ramos:Centre de Nanosciences et de Nanotechnologies, UMR 9001 (CNRS/Université Paris-Sud), Université Paris-Saclay, 91405 Orsay, France
Delphine Marris-Morini:Centre de Nanosciences et de Nanotechnologies, UMR 9001 (CNRS/Université Paris-Sud), Université Paris-Saclay, 91405 Orsay, France
Laurent Vivien:Centre de Nanosciences et de Nanotechnologies, UMR 9001 (CNRS/Université Paris-Sud), Université Paris-Saclay, 91405 Orsay, France
Eric Cassan:Centre de Nanosciences et de Nanotechnologies, UMR 9001 (CNRS/Université Paris-Sud), Université Paris-Saclay, 91405 Orsay, France

联系人作者:Eric Cassan(eric.cassan@u-psud.fr)

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引用该论文

Samuel Serna, Weiwei Zhang, Thi Hong Cam Hoang, Carlos Alonso-Ramos, Delphine Marris-Morini, Laurent Vivien, and Eric Cassan, "Mode selection and dispersion engineering in Bragg-like slot photonic crystal waveguides for hybrid light–matter interactions," Photonics Research 6(1), 54 (2018)

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