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Design of free-space couplers for suspended triangular nano-beam waveguides

Hadden, J. P. ORCID:, Maynard, Cobi, Beggs, Daryl M. ORCID:, Taylor, Robert A. and Bennett, Anthony J. ORCID: 2022. Design of free-space couplers for suspended triangular nano-beam waveguides. Journal of Physics D: Applied Physics 55 (47) , 474002. 10.1088/1361-6463/ac941e

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Photonic waveguides (WGs) with triangular cross section are being investigated for material systems such as diamond, glasses and gallium nitride, which lack easy options to create conventional rectangular nanophotonic waveguides. The design rules for optical elements in these triangular WGs, such as couplers and gratings, are not well established. Here we present simulations of elements designed to couple light into, and out of, triangular WGs from the vertical direction, which can be implemented with current angled-etch fabrication technology. The devices demonstrate coupling efficiencies approaching 50% for light focused from a high numerical aperture objective. The implementation of such couplers will enable fast and efficient testing of closely spaced integrated circuit components.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Physics and Astronomy
Additional Information: License information from Publisher: LICENSE 1: URL:, Type: cc-by
Publisher: IOP Publishing
ISSN: 0022-3727
Date of First Compliant Deposit: 6 October 2022
Date of Acceptance: 22 September 2022
Last Modified: 30 Nov 2022 08:55

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