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Surface-grating-coupled low-loss Ge-on-Si rib waveguides and multimode interferometers

Surface-grating-coupled low-loss Ge-on-Si rib waveguides and multimode interferometers
Surface-grating-coupled low-loss Ge-on-Si rib waveguides and multimode interferometers
Germanium-on-silicon is a highly promising platform for planar photonics for the midinfrared, due to germanium’s wide transparency range. In this letter, we report Ge-on-Si waveguides with record low losses of only 0.6 dB/cm, which is achieved using a 2.9 µm thick germanium layer, thus minimizing mode interaction with dislocations at the germanium/silicon interface. Using these waveguides, multimode interferometers with insertion losses of only 0.21 ± 0.02 dB are also demonstrated.
mid-infrared, germanium, waveguides
1041-1135
1040-1043
Nedeljković, Milos
b64e21c2-1b95-479d-a35c-3456dff8c796
Soler Penadés, Jordi
f18f3619-0d71-4547-95fd-dd38c37b7adb
Mitchell, Colin J.
0e48c936-a405-434d-818a-d83e382aa826
Khokhar, Ali Z.
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Stanković, Stevan
13e8c464-b876-405a-b442-7c437a6eafd3
Domínguez Bucio, Thalía
83b57799-c566-473c-9b53-92e9c50b4287
Littlejohns, Callum
0fd6585d-030d-4d8f-a411-6fc03e083efa
Gardes, Frederic Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Mashanovich, Goran Z.
c806e262-af80-4836-b96f-319425060051
Nedeljković, Milos
b64e21c2-1b95-479d-a35c-3456dff8c796
Soler Penadés, Jordi
f18f3619-0d71-4547-95fd-dd38c37b7adb
Mitchell, Colin J.
0e48c936-a405-434d-818a-d83e382aa826
Khokhar, Ali Z.
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Stanković, Stevan
13e8c464-b876-405a-b442-7c437a6eafd3
Domínguez Bucio, Thalía
83b57799-c566-473c-9b53-92e9c50b4287
Littlejohns, Callum
0fd6585d-030d-4d8f-a411-6fc03e083efa
Gardes, Frederic Y.
7a49fc6d-dade-4099-b016-c60737cb5bb2
Mashanovich, Goran Z.
c806e262-af80-4836-b96f-319425060051

Nedeljković, Milos, Soler Penadés, Jordi, Mitchell, Colin J., Khokhar, Ali Z., Stanković, Stevan, Domínguez Bucio, Thalía, Littlejohns, Callum, Gardes, Frederic Y. and Mashanovich, Goran Z. (2015) Surface-grating-coupled low-loss Ge-on-Si rib waveguides and multimode interferometers. IEEE Photonics Technology Letters, 27 (10), 1040-1043. (doi:10.1109/LPT.2015.2405611).

Record type: Article

Abstract

Germanium-on-silicon is a highly promising platform for planar photonics for the midinfrared, due to germanium’s wide transparency range. In this letter, we report Ge-on-Si waveguides with record low losses of only 0.6 dB/cm, which is achieved using a 2.9 µm thick germanium layer, thus minimizing mode interaction with dislocations at the germanium/silicon interface. Using these waveguides, multimode interferometers with insertion losses of only 0.21 ± 0.02 dB are also demonstrated.

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More information

e-pub ahead of print date: 19 February 2015
Published date: 15 May 2015
Keywords: mid-infrared, germanium, waveguides
Organisations: Optoelectronics Research Centre, Photonic Systems Circuits & Sensors

Identifiers

Local EPrints ID: 385678
URI: https://eprints.soton.ac.uk/id/eprint/385678
ISSN: 1041-1135
PURE UUID: 24d09c0d-bd5d-4922-aec7-6960d9026998
ORCID for Milos Nedeljković: ORCID iD orcid.org/0000-0002-9170-7911
ORCID for Jordi Soler Penadés: ORCID iD orcid.org/0000-0002-1706-8533
ORCID for Stevan Stanković: ORCID iD orcid.org/0000-0001-6154-3138
ORCID for Thalía Domínguez Bucio: ORCID iD orcid.org/0000-0002-3664-1403

Catalogue record

Date deposited: 13 Jan 2016 11:32
Last modified: 19 Mar 2019 01:30

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Contributors

Author: Milos Nedeljković ORCID iD
Author: Colin J. Mitchell
Author: Ali Z. Khokhar
Author: Stevan Stanković ORCID iD
Author: Callum Littlejohns

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