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
27431-27441
Nedeljković, Milos
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Soler Penadés, Jordi
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Mittal, Vinita
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Murugan, Ganapathy Senthil
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Khokhar, Ali Z.
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Littlejohns, Callum
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Carpenter, Lewis G.
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Gawith, Corin B. E.
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Wilkinson, James S.
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Mashanovich, Goran Z.
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30 October 2017
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 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 Penadés, 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), .
(doi:10.1364/OE.25.027431).
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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oe-25-22-27431
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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
Identifiers
Local EPrints ID: 416108
URI: http://eprints.soton.ac.uk/id/eprint/416108
ISSN: 1094-4087
PURE UUID: 52d5850f-bf07-4ef7-b937-10a36160fad8
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Date deposited: 04 Dec 2017 17:30
Last modified: 29 Oct 2024 02:45
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