Air-clad suspended nanocrystalline diamond ridge waveguides

Abdou, Aly, Panduranga, Parashara, Richter, Jens, Thomas, Evan L. H., Mandal, Soumen ORCID: https://orcid.org/0000-0001-8912-1439, Williams, Oliver A. ORCID: https://orcid.org/0000-0002-7210-3004, Witzens, Jeremy and Nezhad, Maziar P. 2018. Air-clad suspended nanocrystalline diamond ridge waveguides. Optics Express 26 (11) , 13883. 10.1364/OE.26.013883

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Abstract

A hybrid group IV ridge waveguide platform is demonstrated, with potential application across the optical spectrum from ultraviolet to the far infrared wavelengths. The waveguides are fabricated by partial etching of sub-micron ridges in a nanocrystalline diamond thin film grown on top of a silicon wafer. To create vertical confinement, the diamond film is locally undercut by exposing the chip to an isotropic fluorine plasma etch via etch holes surrounding the waveguides, resulting in a mechanically stable suspended air-clad waveguide platform. Optical characterization of the waveguides at 1550 nm yields an average optical loss of 4.67 ± 0.47 dB/mm. Further improvement to the fabrication process is expected to significantly reduce this waveguide loss.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Optical Society of America
ISSN:	1094-4087
Date of First Compliant Deposit:	14 June 2018
Date of Acceptance:	3 May 2018
Last Modified:	06 Jan 2024 02:37
URI:	https://orca.cardiff.ac.uk/id/eprint/112247

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