| Download | - View final version: Highly efficient ultra-broad beam silicon nanophotonic antenna based on near-field phase engineering (PDF, 3.5 MiB)
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| DOI | Resolve DOI: https://doi.org/10.1038/s41598-022-23460-x |
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| Author | Search for: Khajavi, Shahrzad; Search for: Melati, Daniele; Search for: Cheben, Pavel1; Search for: Schmid, Jens H.1; Search for: Ramos, Carlos A. Alonso; Search for: Ye, Winnie N. |
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| Affiliation | - National Research Council of Canada. Advanced Electronics and Photonics
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| Funder | Search for: National Research Council Canada; Search for: Natural Sciences and Engineering Research Council of Canada |
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| Format | Text, Article |
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| Abstract | Optical antennas are a fundamental element in optical phased arrays (OPA) and free-space optical interconnects. An outstanding challenge in optical antenna design lies in achieving high radiation efficiency, ultra-compact footprint and broad radiation angle simultaneously, as required for dense 2D OPAs with a broad steering range. Here, we demonstrate a fundamentally new concept of a nanophotonic antenna based on near-field phase-engineering. By introducing a specific near-field phase factor in the Fraunhofer transformation, the far-field beam is widened beyond the diffraction limit for a given aperture size. We use transversally interleaved subwavelength grating nanostructures to control the near-field phase. A Bragg reflector is used at the end of the grating to increase both the efficiency and the far-field beam width. The antenna has a compact footprint of 3.1 µm × 1.75 µm and an ultra-broad far-field beam width of 52° and 62° in the longitudinal and transversal direction, respectively, while the radiation efficiency reaches 82% after incorporating a bottom reflector to further improve the directionality. This unprecedented design performance is achieved with a single-etch grating nanostructure in a 300-nm SOI platform. |
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| Publication date | 2022-11-05 |
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| Publisher | Springer |
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| Licence | |
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| In | |
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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 | 14d21b21-6f0c-462e-b6e4-0883e50fd249 |
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| Record created | 2023-12-14 |
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| Record modified | 2023-12-14 |
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