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Towards low loss non-volatile phase change materials in mid index waveguides

Towards low loss non-volatile phase change materials in mid index waveguides
Towards low loss non-volatile phase change materials in mid index waveguides
Photonic integrated circuits currently use platform intrinsic thermo-optic and electro-optic effects to implement dynamic functions such as switching, modulation and other processing. Currently, there is a drive to implement field programmable photonic circuits, a need which is only magnified by new neuromorphic and quantum computing applications. The most promising non-volatile photonic components employ phase change materials such as GST and GSST, which had their origin in electronic memory. However, in the optical domain, these compounds introduce significant losses potentially preventing a large number of applications. Here, we evaluate the use of two newly introduced low loss phase change materials, Sb2S3 and Sb2Se3, on a silicon nitride photonic platform. We focus the study on Mach-Zehnder interferometers that operate at the O and C bands to demonstrate the performance of the system. Our measurements show an insertion loss below 0.04 dB/um for Sb2S3 and lower than 0.09 dB/um for Sb2Se3 cladded devices for both amorphous and crystalline phases. The effective refractive index contrast for Sb2S3 on SiNx was measured to be 0.05 at 1310 nm and 0.02 at 1550 nm, whereas for Sb2Se3, it was 0.03 at 1310 nm and 0.05 at 1550 nm highlighting the performance of the integrated device.
physics.optics, eess.SP
2634-4386
Faneca, Joaquin
03751f71-8e60-4d95-849b-a6f03b2e4051
Zeimpekis, Ioannis
a2c354ec-3891-497c-adac-89b3a5d96af0
Ilie, S. T.
9ff80b2a-1998-41dd-9eed-7b010cbbf3a9
Domínguez Bucio, Thalía
83b57799-c566-473c-9b53-92e9c50b4287
Grabska, Katarzyna
b8a061e3-7774-4b33-be83-74e1a0aec31a
Hewak, Daniel W.
87c80070-c101-4f7a-914f-4cc3131e3db0
Gardes, Frederic Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Faneca, Joaquin
03751f71-8e60-4d95-849b-a6f03b2e4051
Zeimpekis, Ioannis
a2c354ec-3891-497c-adac-89b3a5d96af0
Ilie, S. T.
9ff80b2a-1998-41dd-9eed-7b010cbbf3a9
Domínguez Bucio, Thalía
83b57799-c566-473c-9b53-92e9c50b4287
Grabska, Katarzyna
b8a061e3-7774-4b33-be83-74e1a0aec31a
Hewak, Daniel W.
87c80070-c101-4f7a-914f-4cc3131e3db0
Gardes, Frederic Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2

Faneca, Joaquin, Zeimpekis, Ioannis, Ilie, S. T., Domínguez Bucio, Thalía, Grabska, Katarzyna, Hewak, Daniel W. and Gardes, Frederic Y. (2021) Towards low loss non-volatile phase change materials in mid index waveguides. Neuromorphic Computing and Engineering, 1 (1).

Record type: Article

Abstract

Photonic integrated circuits currently use platform intrinsic thermo-optic and electro-optic effects to implement dynamic functions such as switching, modulation and other processing. Currently, there is a drive to implement field programmable photonic circuits, a need which is only magnified by new neuromorphic and quantum computing applications. The most promising non-volatile photonic components employ phase change materials such as GST and GSST, which had their origin in electronic memory. However, in the optical domain, these compounds introduce significant losses potentially preventing a large number of applications. Here, we evaluate the use of two newly introduced low loss phase change materials, Sb2S3 and Sb2Se3, on a silicon nitride photonic platform. We focus the study on Mach-Zehnder interferometers that operate at the O and C bands to demonstrate the performance of the system. Our measurements show an insertion loss below 0.04 dB/um for Sb2S3 and lower than 0.09 dB/um for Sb2Se3 cladded devices for both amorphous and crystalline phases. The effective refractive index contrast for Sb2S3 on SiNx was measured to be 0.05 at 1310 nm and 0.02 at 1550 nm, whereas for Sb2Se3, it was 0.03 at 1310 nm and 0.05 at 1550 nm highlighting the performance of the integrated device.

Text
2101.11127v1 - Accepted Manuscript
Available under License Creative Commons Attribution.
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More information

Accepted/In Press date: 16 July 2021
Published date: 23 August 2021
Additional Information: 11 pages, 7 figures
Keywords: physics.optics, eess.SP

Identifiers

Local EPrints ID: 451320
URI: http://eprints.soton.ac.uk/id/eprint/451320
ISSN: 2634-4386
PURE UUID: 4df1edef-4609-43bd-b7d4-aa66d403b93f
ORCID for Thalía Domínguez Bucio: ORCID iD orcid.org/0000-0002-3664-1403
ORCID for Daniel W. Hewak: ORCID iD orcid.org/0000-0002-2093-5773

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Date deposited: 21 Sep 2021 16:30
Last modified: 05 Oct 2021 01:54

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