Dieses Dokument steht unter einer CreativeCommons Lizenz by/4.0
Verlagslink DOI: 10.1038/s41598-018-36082-z
Titel: Backscattering design for a focusing grating coupler with fully etched slots for transverse magnetic modes
Sprache: English
Autor/Autorin: Hoffmann, Jahn 
Schulz, Kai Marvin 
Pitruzzello, Giampaolo 
Fohrmann, Lena Simone 
Petrov, Alexander Yu 
Eich, Manfred 
Erscheinungsdatum: 10-Dez-2018
Verlag: Macmillan Publishers Limited, part of Springer Nature
Quellenangabe: Scientific Reports 1 (8): - (2018-12-01)
Zeitschrift oder Schriftenreihe: Scientific reports 
Zusammenfassung (englisch): Grating couplers are a fundamental building block of integrated optics as they allow light to be coupled from free-space to on-chip components and vice versa. A challenging task in designing any grating coupler is represented by the need for reducing back reflections at the waveguide-grating interface, which introduce additional losses and undesirable interference fringes. Here, we present a design approach for focusing TM grating couplers that minimizes these unwanted reflections by introducing a modified slot that fulfills an anti-reflection condition. We show that this antireflection condition can be met only for the Bloch mode of the grating that concentrates in the dielectric. As a consequence the light is scattered from the grating coupler with a negative angle, referred to as “backscattering design”. Our analytic model shows that the anti-reflection condition is transferrable to grating couplers on different waveguide platforms and that it applies for both TE and TM polarizations. Our experimentally realized focusing grating coupler for TM-modes on the silicon photonics platform has a coupling loss of (3.95 ± 0.15) dB at a wavelength of 1.55 µm. It has feature sizes above 200 nm and fully etched slots. The reflectivity between the grating coupler and the connected waveguide is suppressed to below 0.16%.
URI: https://tubdok.tub.tuhh.de/handle/11420/1991
DOI: 10.15480/882.1988
ISSN: 2045-2322
Institut: Optische und Elektronische Materialien E-12 
Dokumenttyp: (wissenschaftlicher) Artikel
Projekt: Open Access Publizieren 2018 - 2019 / TU Hamburg 
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