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Unidirectional data center interconnects enabled by the use of broken-symmetry gap plasmon resonators (BS-GPR)
Author(s): Bogdan Sirbu; Tolga Tekin; Jean-Claude Weeber; Alain Dereux; Laurent Markey
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Paper Abstract

Grating couplers are the most versatile mechanism to couple light efficiently into photonic interconnects, such as waveguides featuring submicronic cross-sections. Usually grating couplers are used in a tilted illumination configuration in order to obtain unidirectional excitation of the waveguide, requiring challenges in assembly and packaging.

In practical applications, tilted illumination of the gratings is not always possible in particular for fully integrated electrooptical printed circuit board (EO-PCB) with a light source (Vertical-Cavity Surface-Emitting Laser (VCSEL)) and an optical layer implanted on each side of the board. In this case, the incoming light hits the gratings couplers at normal incidence and specific strategies are needed to achieve unidirectional excitation of the guided mode.

In this work, a novel unidirectional Data Center coupling concept based on the use of gap plasmon polariton (GPR) grating couplers sustained by Metal-Insulator-Metal (MIM) resonators is introduced. Unlike traditional challenging subwavelength coupling schemes based on plasmonics and Si-Photonics, we consider non-symmetric GPR featuring highly directional scattering efficiency. The plasmonic gratings have been modelled numerically employing a Fourier Modal Method and the results have been confirmed by FEM simulations.

Paper Details

Date Published: 4 March 2019
PDF: 6 pages
Proc. SPIE 10924, Optical Interconnects XIX, 1092414 (4 March 2019); doi: 10.1117/12.2513907
Show Author Affiliations
Bogdan Sirbu, Fraunhofer-Institut für Zuverlässigkeit und Mikrointegration (Germany)
Technical Univ. Berlin (Germany)
Tolga Tekin, Fraunhofer-Institut für Zuverlässigkeit und Mikrointegration (Germany)
Technical Univ. Berlin (Germany)
Jean-Claude Weeber, Lab. Interdisciplinaire Carnot de Bourgogne, CNRS, Univ. de Bourgogne (France)
Alain Dereux, Lab. Interdisciplinaire Carnot de Bourgogne, CNRS, Univ. de Bourgogne (France)
Laurent Markey, Lab. Interdisciplinaire Carnot de Bourgogne, CNRS, Univ. de Bourgogne (France)


Published in SPIE Proceedings Vol. 10924:
Optical Interconnects XIX
Henning Schröder; Ray T. Chen, Editor(s)

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