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Ultra-compact and ultra-broadband hybrid plasmonic-photonic vertical coupler with high coupling efficiency, directivity, and polarisation extinction ratio

Pezeshki, Hamed; Wright, Amanda J.; Larkins, Eric C.

Ultra-compact and ultra-broadband hybrid plasmonic-photonic vertical coupler with high coupling efficiency, directivity, and polarisation extinction ratio Thumbnail


Authors

Hamed Pezeshki

ERIC LARKINS eric.larkins@nottingham.ac.uk
Professor of Opto-Electronics



Abstract

An ultra-compact, ultra-broadband vertical coupler for dense photonic integrated circuits is reported with a 1.07×0.62μm2 wavelength-scale footprint. This hybrid plasmonic-photonic coupler uses a unique two-plane plasmonic nanoantenna array on a silicon-on-insulator waveguide. The in- and out-of-plane interference of the multipole moments and dual-feed nanoantennas results in efficient, unidirectional coupling. Finite-element simulations show that, for a 0.8μm diameter Gaussian beam, the maximum coupling efficiency (CE) is −3.4dB across the telecommunication C-, L- and U-bands with a 3-dB bandwidth of 230nm. The CE is>9dB higher than recently reported ultra-compact plasmonic couplers. The maximum directivity and polarisation extinction ratio across the C- to U-bands are 9.2 and 24.1dB, respectively. Finally, as an out-coupler, it has a vertical directivity of >8.5dB, enabling its use for vertical optical interconnects between two vertically separated circuits.

Journal Article Type Article
Acceptance Date Dec 3, 2021
Online Publication Date Jan 4, 2022
Publication Date 2022-06
Deposit Date Jan 21, 2022
Publicly Available Date Jan 21, 2022
Journal IET Optoelectronics
Electronic ISSN 1751-8776
Publisher Institution of Engineering and Technology (IET)
Peer Reviewed Peer Reviewed
Volume 16
Issue 3
Pages 124-132
DOI https://doi.org/10.1049/ote2.12063
Keywords Electrical and Electronic Engineering; Atomic and Molecular Physics, and Optics
Public URL https://nottingham-repository.worktribe.com/output/7283295
Publisher URL https://ietresearch.onlinelibrary.wiley.com/doi/10.1049/ote2.12063

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