Design and crosstalk suppression of deep subwavelength waveguides

Yimian Qin; Cunbao Ma; Lihao Huang; Yufeng Yuan; Minggong Sha; Xinli Ye; Kai Zheng

doi:10.1117/12.3005775

24 November 2023 Design and crosstalk suppression of deep subwavelength waveguides

Yimian Qin, Cunbao Ma, Lihao Huang, Yufeng Yuan, Minggong Sha, Xinli Ye, Kai Zheng

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 1293518 (2023) https://doi.org/10.1117/12.3005775
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

To manipulate on-chip mid-IR signals, it is pivotal to construct a waveguide with subwavelength energy confinement. However, a deep subwavelength optical waveguide always suffers from high signal crosstalk, resulting in an inevitable coupling loss of multi-channel communication. To solve this problem, in this paper, a mid-IR hybrid waveguide which is composed of a graphene/hexagonal boron nitride (hBN) structure and a dielectric waveguide, is designed to realize a strongly enhanced light-matter interaction, accompanied by a low crosstalk transmission. The surface-phonon-plasmon-polariton mode generated by the graphene-hBN is coupled to a nanowire dielectric mode to form a hybrid guiding mode. Benefiting from this hybrid mode, the results show that it is possible to minimize the crosstalk of two parallel waveguides by reducing the width of the graphene-hexagonal hBN structure even if the waveguide separation length is at the nanoscale, thereby enabling low crosstalk optical transmission. Our designed approach opens the door for possible uses in nanophotonic devices such as amplitude equalizers, mode multiplexers, and wavelength-selective switches in optical communication systems.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yimian Qin, Cunbao Ma, Lihao Huang, Yufeng Yuan, Minggong Sha, Xinli Ye, and Kai Zheng "Design and crosstalk suppression of deep subwavelength waveguides", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 1293518 (24 November 2023); https://doi.org/10.1117/12.3005775

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KEYWORDS

Waveguides

Crosstalk

Graphene

Silicon

Nanowires

Design and modelling

Mid-IR

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