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Germanium-on-silicon waveguides operating at mid-infrared wavelengths up to 8.5 μm

Germanium-on-silicon waveguides operating at mid-infrared wavelengths up to 8.5 μm
Germanium-on-silicon waveguides operating at mid-infrared wavelengths up to 8.5 μm
We report transmission measurements of germanium on silicon waveguides in the 7.5–8.5 μm wavelength range, with a minimum propagation loss of 2.5 dB/cm at 7.575 μm. However, we find an unexpected strongly increasing loss at higher wavelengths, potential causes of which we discuss in detail. We also demonstrate the first germanium on silicon multimode interferometers operating in this range, as well as grating couplers optimized for measurement using a long wavelength infrared camera. Finally, we use an implementation of the “cut-back” method for loss measurements that allows simultaneous transmission measurement through multiple waveguides of different lengths, and we use dicing in the ductile regime for fast and reproducible high quality optical waveguide end-facet preparation.
Integrated optics, Infrared, Semiconductors
1094-4087
27431-27441
Nedeljković, Milos
b64e21c2-1b95-479d-a35c-3456dff8c796
Soler Penades, Jordi
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Mittal, Vinita
fd5ee9dd-7770-416f-8f47-50ca158b39b0
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Khokhar, Ali Z.
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Littlejohns, Callum
d2837f04-0a83-4bf9-acb2-618aa42a0cad
Carpenter, Lewis G.
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Gawith, Corin B. E.
926665c0-84c7-4a1d-ae19-ee6d7d14c43e
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Mashanovich, Goran Z.
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Nedeljković, Milos
b64e21c2-1b95-479d-a35c-3456dff8c796
Soler Penades, Jordi
f18f3619-0d71-4547-95fd-dd38c37b7adb
Mittal, Vinita
fd5ee9dd-7770-416f-8f47-50ca158b39b0
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Khokhar, Ali Z.
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Littlejohns, Callum
d2837f04-0a83-4bf9-acb2-618aa42a0cad
Carpenter, Lewis G.
0daa548e-0d42-4b06-b914-45bfbec41759
Gawith, Corin B. E.
926665c0-84c7-4a1d-ae19-ee6d7d14c43e
Wilkinson, James S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Mashanovich, Goran Z.
c806e262-af80-4836-b96f-319425060051

Nedeljković, Milos, Soler Penades, Jordi, Mittal, Vinita, Murugan, Ganapathy Senthil, Khokhar, Ali Z., Littlejohns, Callum, Carpenter, Lewis G., Gawith, Corin B. E., Wilkinson, James S. and Mashanovich, Goran Z. (2017) Germanium-on-silicon waveguides operating at mid-infrared wavelengths up to 8.5 μm. Optics Express, 25 (22), 27431-27441. (doi:10.1364/OE.25.027431).

Record type: Article

Abstract

We report transmission measurements of germanium on silicon waveguides in the 7.5–8.5 μm wavelength range, with a minimum propagation loss of 2.5 dB/cm at 7.575 μm. However, we find an unexpected strongly increasing loss at higher wavelengths, potential causes of which we discuss in detail. We also demonstrate the first germanium on silicon multimode interferometers operating in this range, as well as grating couplers optimized for measurement using a long wavelength infrared camera. Finally, we use an implementation of the “cut-back” method for loss measurements that allows simultaneous transmission measurement through multiple waveguides of different lengths, and we use dicing in the ductile regime for fast and reproducible high quality optical waveguide end-facet preparation.

Text
oe-25-22-27431 - Version of Record
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Accepted/In Press date: 14 September 2017
e-pub ahead of print date: 24 October 2017
Published date: 30 October 2017
Keywords: Integrated optics, Infrared, Semiconductors
Learn more about Institute for Life Sciences research Learn more about Optoelectronics Research Centre research

Identifiers

Local EPrints ID: 416108
URI: http://eprints.soton.ac.uk/id/eprint/416108
DOI: doi:10.1364/OE.25.027431
ISSN: 1094-4087
PURE UUID: 52d5850f-bf07-4ef7-b937-10a36160fad8
ORCID for Milos Nedeljković: ORCID iD orcid.org/0000-0002-9170-7911
ORCID for Jordi Soler Penades: ORCID iD orcid.org/0000-0002-1706-8533
ORCID for Vinita Mittal: ORCID iD orcid.org/0000-0003-4836-5327
ORCID for Ganapathy Senthil Murugan: ORCID iD orcid.org/0000-0002-2733-3273
ORCID for Corin B. E. Gawith: ORCID iD orcid.org/0000-0002-3502-3558
ORCID for James S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

Catalogue record

Date deposited: 04 Dec 2017 17:30
Last modified: 10 Jan 2022 02:50

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Contributors

Author: Milos Nedeljković ORCID iD
Author: Jordi Soler Penades ORCID iD
Author: Vinita Mittal ORCID iD
Author: Ganapathy Senthil Murugan ORCID iD
Author: Ali Z. Khokhar
Author: Callum Littlejohns
Author: Lewis G. Carpenter
Author: Corin B. E. Gawith ORCID iD
Author: James S. Wilkinson ORCID iD
Author: Goran Z. Mashanovich

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