Grating couplers in silicon-on-insulator: The role of photonic guided resonances on lineshape and bandwidth

Show simple item record Passoni, M. Gerace, Dario Carroll, Lee Andreani, L. C. 2017-02-01T11:19:04Z 2017-02-01T11:19:04Z 2017-01-27
dc.identifier.citation Passoni, M., Gerace, D., Carroll, L. and Andreani, L. C. (2017) 'Grating couplers in silicon-on-insulator: The role of photonic guided resonances on lineshape and bandwidth', Applied Physics Letters, 110(4), pp. 041107. doi:10.1063/1.4974992 en
dc.identifier.volume 110 en
dc.identifier.issued 4 en
dc.identifier.startpage 041107-1 en
dc.identifier.endpage 041107-5 en
dc.identifier.issn 0003-6951
dc.identifier.issn 1077-3118
dc.identifier.doi 10.1063/1.4974992
dc.description.abstract Most grating couplers for silicon photonics are designed to match the approximately 10 μm mode-field diameter (MFD) of single-mode telecom fibres. In this letter, we analyse grating-coupler designs in the Silicon-on-Insulator (SOI) platform in a wide range of MFDs (4–100 μm) and related footprints, to give a physical understanding of the trends in efficiency and lineshape of the corresponding coupling spectra. We show that large-footprint grating couplers have an intrinsic Lorentzian lineshape that is determined by the quasi-guided photonic modes (or guided resonances) of the corresponding photonic crystal slab, while small-footprint grating couplers have a Gaussian lineshape resulting from the k-space broadening of the incident mode. The crossover between the two regimes is characterized by Voigt lineshapes. Multi-objective particle-swarm optimisation of selected small-footprint apodized grating-couplers is then used to locate the “Pareto fronts;” along which the highest coupling efficiency is achieved for a given bandwidth. This approach identifies several high-efficiency 220 nm SOI grating coupler designs with 1 dB bandwidths exceeding 100 nm. Such grating couplers are ideally suited for broadband photonic applications, such as wavelength-division multiplexing and environmental sensing, and are compatible with commercially available ultra-high numerical aperture fibres. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher AIP Publishing en
dc.rights © 2017, AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Appl. Phys. Lett. 110, 041107 (2017) and may be found at en
dc.subject Diffraction gratings en
dc.subject Photonics en
dc.subject Photonic crystals en
dc.subject Silicon en
dc.subject Etching en
dc.title Grating couplers in silicon-on-insulator: The role of photonic guided resonances on lineshape and bandwidth en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Lee Carroll, Technology Manager (PIXAPP), Tyndall National Institute, University College Cork, Cork, Ireland. E: en
dc.internal.availability Full text available en Access to this article is restricted until 12 months after publication by the request of the publisher. en 2018-01-27
dc.description.version Published Version en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Applied Physics Letters en

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