| DOI | Resolve DOI: https://doi.org/10.1364/OL.43.004691 |
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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: Velasco, Aitor V.; Search for: Cheben, Pavel1ORCID identifier: https://orcid.org/0000-0003-4232-9130; Search for: Schmid, Jens H.1; Search for: Wang, Shurui1; Search for: Halir, Robert |
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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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| Abstract | Subwavelength grating (SWG) structures are an essential tool in silicon photonics, enabling the synthesis of metamaterials with a controllable refractive index. Here we propose, for the first time to the best of our knowledge, tilting the grating elements to gain control over the anisotropy of the metamaterial. Rigorous finite difference time domain simulations demonstrate that a 45° tilt results in an effective index variation on the fundamental TE mode of 0.23 refractive index units, whereas the change in the TM mode is 20 times smaller. Our simulation predictions are corroborated by experimental results. We furthermore propose an accurate theoretical model for designing tilted SWG structures based on rotated uniaxial crystals that is functional over a wide wavelength range and for both the fundamental and higher order modes. The proposed control over anisotropy opens promising venues in polarization management devices and transformation optics in silicon photonics. |
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| Publication date | 2018 |
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| Publisher | OSA |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 23004242 |
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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 | b3a47b19-5724-4eb0-8848-f6a2ef73659d |
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| Record created | 2018-10-15 |
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| Record modified | 2020-03-16 |
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