Nanofocusing in SOI-based hybrid plasmonic metal slot waveguides

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Title: Nanofocusing in SOI-based hybrid plasmonic metal slot waveguides
Authors: Gusken, N
Nielsen, M
Nguyen, N
Maier, S
Oulton, R
Item Type: Journal Article
Abstract: Abstract: Through a process of efficient dielectric to metallic waveguide mode conversion, we calculate a >400-fold field intensity enhancement in a silicon photonics compatible nanofocusing device. A metallic slot waveguide sits on top of the silicon slab waveguide with nanofocusing being achieved by tapering the slot width gradually. We evaluate the conversion between the numerous photonic modes of the planar silicon waveguide slab and the most confined plasmonic mode of a 20 x 50 nm2 slot in the metallic film. With an efficiency of ~80%, this system enables remarkably effective nanofocusing, although the small amount of inter-mode coupling shows that this structure is not quite adiabatic. In order to couple photonic and plasmonic modes efficiently, in-plane focusing is required, simulated here by curved input grating couplers. The nanofocusing device shows how to efficiently bridge the photonic micro-regime and the plasmonic nano-regime whilst maintaining compatibility with the silicon photonics platform.
Issue Date: 12-Nov-2018
Date of Acceptance: 12-Oct-2018
ISSN: 1094-4087
Publisher: Optical Society of America (OSA)
Start Page: 30634
End Page: 30643
Journal / Book Title: Optics Express
Volume: 26
Issue: 23
Copyright Statement: © 2018 The Author(s). Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
The Leverhulme Trust
Funder's Grant Number: EP/I004343/1
Keywords: Science & Technology
Physical Sciences
0205 Optical Physics
1005 Communications Technologies
0906 Electrical And Electronic Engineering
Publication Status: Published
Appears in Collections:Physics
Experimental Solid State
Faculty of Natural Sciences

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