| DOI | Resolve DOI: https://doi.org/10.1117/12.2522050 |
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| Author | Search for: Luque-González, José Manuel; Search for: Herrero-Bermello, Alaine; Search for: Ortega-Moñux, Alejandro; Search for: Molina-Fernández, Íñigo; Search for: Villafranca Velasco, Aitor; Search for: Cheben, Pavel1; Search for: Schmid, Jens H.1; Search for: Wang, Shurui1; Search for: Halir, Robert |
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| Editor | Search for: Cheben, Pavel; Search for: Čtyroký, Jiří; Search for: Molina-Fernández, Iñigo |
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| Affiliation | - National Research Council of Canada. Advanced Electronics and Photonics
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| Format | Text, Article |
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| Conference | Integrated Optics: Design, Devices, Systems and Applications, April 1-4, 2019, Prague, Czech Republic |
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| Subject | polarization; metamaterials; homogenization; anisotropy; beam splitters; optical design |
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| 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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| Publication date | 2019-04-26 |
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| Publisher | SPIE |
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| In | |
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| Series | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 70dc7d45-5ecb-4f42-9754-32ab5223c603 |
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| Record created | 2021-02-22 |
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| Record modified | 2021-02-22 |
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