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26 April 2019 Designing polarization management devices by tilting subwavelength grating
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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Proceedings Volume 11031, Integrated Optics: Design, Devices, Systems, and Applications V; 110310M (2019) https://doi.org/10.1117/12.2522050
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic
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.
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José Manuel Luque-González, Alaine Herrero-Bermello, Alejandro Ortega-Moñux, Íñigo Molina-Fernández, Aitor V. Velasco, Pavel Cheben, Jens H. Schmid, Shurui Wang, and Robert Halir "Designing polarization management devices by tilting subwavelength grating", Proc. SPIE 11031, Integrated Optics: Design, Devices, Systems, and Applications V, 110310M (26 April 2019); https://doi.org/10.1117/12.2522050
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KEYWORDS
Polarization
Metamaterials
Homogenization
Anisotropy
Beam splitters
Optical design
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