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Designing polarization management devices by tilting subwavelength grating
Author(s): José Manuel Luque-González; Alaine Herrero-Bermello; Alejandro Ortega-Moñux; Íñigo Molina-Fernández; Aitor V. Velasco; Pavel Cheben; Jens H. Schmid; Shurui Wang; Robert Halir
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Paper Abstract

Subwavelength gratings (SWG) are periodic structures which behave as controllable homogeneous metamaterials. SWGs are extremely interesting when they are used in platforms with a limited choice of material refractive indices, enabling the design of a myriad of high-performance devices. Here we present a novel technique to gain control over the intrinsic anisotropy of the synthesized metamaterial. We show that tilting the silicon segments in a SWG structure mainly affects the in-plane (TE) modes, with little impact on the out-of-plane (TM) modes. Moreover, we present a methodology to quickly but accurately calculate the modes of a tilted periodic structure modeling the structure as a rotated uniaxial crystal which can be solved with an anisotropic mode solver. Measurements on a set of fabricated tilted SWG waveguides validate our simulation results. By using the presented technique, we design a polarization beam splitter based on a 2x2 multimode interferometer. The design is based on the optimization of the tilting angle to tone the beat length of the TE modes to be a half of the beat length of the TM modes.

Paper Details

Date Published: 26 April 2019
PDF: 6 pages
Proc. SPIE 11031, Integrated Optics: Design, Devices, Systems, and Applications V, 110310M (26 April 2019); doi: 10.1117/12.2522050
Show Author Affiliations
José Manuel Luque-González, Univ. de Málaga (Spain)
Alaine Herrero-Bermello, Spanish National Research Council (Spain)
Alejandro Ortega-Moñux, Univ. de Málaga (Spain)
Íñigo Molina-Fernández, Univ. de Málaga (Spain)
Bionand Ctr. for Nanomedicine and Biotechnology (Spain)
Aitor V. Velasco, Spanish National Research Council (Spain)
Bionand Ctr. for Nanomedicine and Biotechnology (Spain)
Pavel Cheben, National Research Council Canada (Canada)
Jens H. Schmid, National Research Council Canada (Canada)
Shurui Wang, National Research Council Canada (Canada)
Robert Halir, Univ. de Málaga (Spain)
Bionand Ctr. for Nanomedicine and Biotechnology (Spain)


Published in SPIE Proceedings Vol. 11031:
Integrated Optics: Design, Devices, Systems, and Applications V
Pavel Cheben; Jiří Čtyroký; Iñigo Molina-Fernández, Editor(s)

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