Coupling a silicon-on-insulator waveguide to a metal–dielectric–metal plasmonic waveguide through a vertical and lateral taper-funnel structure

Designing efficient and compact couplers is crucial in hybrid integration of plasmonic components with conventional silicon-on-insulator components. Taper-funnel structures are conventionally used to couple light from a silicon strip waveguide to a metal–dielectric–metal plasmonic waveguide. In this...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2020-05, Vol.126 (5), Article 94
Main Authors: Badri, S. Hadi, Gilarlue, M. M.
Format: Article
Language:English
Subjects:
Applied physics
C band
Computer simulation
Couplers
Coupling
Engineering
Lasers
Optical communication
Optical Devices
Optics
Photonics
Physical Chemistry
Physics
Physics and Astronomy
Plasmonics
Quantum Optics
Silicon
SOI (semiconductors)
Tapering
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Summary:Designing efficient and compact couplers is crucial in hybrid integration of plasmonic components with conventional silicon-on-insulator components. Taper-funnel structures are conventionally used to couple light from a silicon strip waveguide to a metal–dielectric–metal plasmonic waveguide. In this paper, we investigate the effect of different parameters of the metallic funnel and the vertically and laterally tapered silicon waveguide on the performance of the designed coupler. Numerical simulations indicate that the tuned coupler has an average coupling efficiency of 87% in the C-band. The designed 1.18-µm-long coupler has a shorter length compared to the previous designs, while its theoretical coupling efficiency is higher than 85% in the entire O, E, S, C, L, and U bands of optical communication.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-020-07454-z