Journal
SCIENTIFIC REPORTS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-019-40497-7
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Funding
- Spanish Ministry of Science, Innovation and Universities [TEC2015-71127-C2-1-R, BES-2016-077798, IJCI-2016-30484]
- Community of Madrid [S2013/MIT-2790]
- EMPIR program [JRP-i22 14IND13 Photind]
- European Union's Horizon 2020 research and innovation program
- Horizon 2020 research and innovation program under the Marie SklodowskaCurie Grant [734331]
- Agence National pour la Recherche, Project MIRSPEC [ANR-17-CE09-0041]
- H2020 European Research Council (ERC) [ERC POPSTAR 647342]
- Conseil General de l'Essonne
- French RENATECH network
- Agence Nationale de la Recherche (ANR) [ANR-17-CE09-0041] Funding Source: Agence Nationale de la Recherche (ANR)
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High-performance optical beam splitters are of fundamental importance for the development of advanced silicon photonics integrated circuits. However, due to the high refractive index contrast of silicon-on-insulator platforms, state-of-the-art nanophotonic splitters are hampered by trade-offs in bandwidth, polarization dependence and sensitivity to fabrication errors. Here, we present a new strategy that exploits modal engineering in slotted waveguides to overcome these limitations, enabling ultra-broadband polarization-insensitive optical power splitters with relaxed fabrication tolerances. The proposed splitter design relies on a single-mode slot waveguide that is gradually transformed into two strip waveguides by a symmetric taper, yielding equal power splitting. Based on this concept, we experimentally demonstrate -3 +/- 0.5 dB polarization-independent transmission for an unprecedented 390 nm bandwidth (1260-1650 nm), even in the presence of waveguide width deviations as large as +/- 25 nm.
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