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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 Penadés, Jordi
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Mittal, Vinita
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Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Khokhar, Ali
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Littlejohns, Callum
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Carpenter, Lewis Glynn
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Gawith, Corin
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Wilkinson, James
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Mashanovich, Goran
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Nedeljković, Milos
b64e21c2-1b95-479d-a35c-3456dff8c796
Soler Penadés, Jordi
f18f3619-0d71-4547-95fd-dd38c37b7adb
Mittal, Vinita
fd5ee9dd-7770-416f-8f47-50ca158b39b0
Murugan, Ganapathy Senthil
a867686e-0535-46cc-ad85-c2342086b25b
Khokhar, Ali
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Littlejohns, Callum
0fd6585d-030d-4d8f-a411-6fc03e083efa
Carpenter, Lewis Glynn
0daa548e-0d42-4b06-b914-45bfbec41759
Gawith, Corin
926665c0-84c7-4a1d-ae19-ee6d7d14c43e
Wilkinson, James
73483cf3-d9f2-4688-9b09-1c84257884ca
Mashanovich, Goran
c806e262-af80-4836-b96f-319425060051

Nedeljković, Milos, Soler Penadés, Jordi, Mittal, Vinita, Murugan, Ganapathy Senthil, Khokhar, Ali, Littlejohns, Callum, Carpenter, Lewis Glynn, Gawith, Corin, Wilkinson, James and Mashanovich, Goran (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.

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Accepted/In Press date: 14 September 2017
e-pub ahead of print date: 24 October 2017
Published date: October 2017
Keywords: Integrated optics, Infrared, Semiconductors

Identifiers

Local EPrints ID: 416108
URI: https://eprints.soton.ac.uk/id/eprint/416108
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 Penadés: 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 Gawith: ORCID iD orcid.org/0000-0002-3502-3558
ORCID for James Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

Catalogue record

Date deposited: 04 Dec 2017 17:30
Last modified: 10 Dec 2019 01:59

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