Zitierlink:
https://doi.org/10.15480/882.1988
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 |
Enthalten in den Sammlungen: | tub.dok |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
---|---|---|---|---|
s41598-018-36082-z.pdf | Verlags-PDF | 1,63 MB | Adobe PDF | Öffnen/Anzeigen |
Seitenansichten
50
Letzte Woche
26
26
Letzten Monat
checked on 18.02.2019
Download(s)
6
checked on 18.02.2019
Google ScholarTM
Prüfe
Export
Diese Ressource wurde unter folgender Copyright-Bestimmung veröffentlicht: Lizenz von Creative Commons