High-efficiency broadband grating out-coupler for thick silicon waveguides with a tuned SiGe layer
We design a novel grating out-coupler while maintaining a Gaussian-shaped far-field output. The approach is based on the patterning of a grating in a SiGe layer on the top surface of a 3-μm-thick Si waveguide. The grating aims at coupling the guided signal into a beam vertically out from the surface...
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| Language: | English |
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EDP Sciences
2025-01-01
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| Series: | Journal of the European Optical Society-Rapid Publications |
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| Online Access: | https://jeos.edpsciences.org/articles/jeos/full_html/2025/02/jeos20250032/jeos20250032.html |
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| author | Muntaha Sidra Tul Doughan Isaac Cherchi Matteo Roussey Matthieu Aalto Timo |
| author_facet | Muntaha Sidra Tul Doughan Isaac Cherchi Matteo Roussey Matthieu Aalto Timo |
| author_sort | Muntaha Sidra Tul |
| collection | DOAJ |
| description | We design a novel grating out-coupler while maintaining a Gaussian-shaped far-field output. The approach is based on the patterning of a grating in a SiGe layer on the top surface of a 3-μm-thick Si waveguide. The grating aims at coupling the guided signal into a beam vertically out from the surface of the chip, i.e., out-coupling. The use of a high refractive index alloy, i.e., silicon-germanium, allows a tunability of the effective index of the guided mode and to modify the field distribution enabling a higher efficiency of the grating. It yields a theoretical efficiency of 75% at the central wavelength of 1583 nm. The overall length of this grating coupler is 500 μm, and the output light is detected at 1 μm above the grating. This type of long grating coupler is intended to be eventually used as sensor in LiDAR (Light detection and ranging) applications. |
| format | Article |
| id | doaj-art-c4e73f049fb144f8b2d1c3d00a171a4f |
| institution | Kabale University |
| issn | 1990-2573 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Journal of the European Optical Society-Rapid Publications |
| spelling | doaj-art-c4e73f049fb144f8b2d1c3d00a171a4f2025-08-20T03:51:09ZengEDP SciencesJournal of the European Optical Society-Rapid Publications1990-25732025-01-012123410.1051/jeos/2025030jeos20250032High-efficiency broadband grating out-coupler for thick silicon waveguides with a tuned SiGe layerMuntaha Sidra Tul0Doughan Isaac1Cherchi Matteo2Roussey Matthieu3https://orcid.org/0000-0002-7679-6995Aalto Timo4Center for Photonics Sciences, University of Eastern FinlandCenter for Photonics Sciences, University of Eastern FinlandVTT Technical Research Center of FinlandCenter for Photonics Sciences, University of Eastern FinlandVTT Technical Research Center of FinlandWe design a novel grating out-coupler while maintaining a Gaussian-shaped far-field output. The approach is based on the patterning of a grating in a SiGe layer on the top surface of a 3-μm-thick Si waveguide. The grating aims at coupling the guided signal into a beam vertically out from the surface of the chip, i.e., out-coupling. The use of a high refractive index alloy, i.e., silicon-germanium, allows a tunability of the effective index of the guided mode and to modify the field distribution enabling a higher efficiency of the grating. It yields a theoretical efficiency of 75% at the central wavelength of 1583 nm. The overall length of this grating coupler is 500 μm, and the output light is detected at 1 μm above the grating. This type of long grating coupler is intended to be eventually used as sensor in LiDAR (Light detection and ranging) applications.https://jeos.edpsciences.org/articles/jeos/full_html/2025/02/jeos20250032/jeos20250032.htmlsilicon germaniumgrating out-couplerlong devicebroad-bandlidar applications |
| spellingShingle | Muntaha Sidra Tul Doughan Isaac Cherchi Matteo Roussey Matthieu Aalto Timo High-efficiency broadband grating out-coupler for thick silicon waveguides with a tuned SiGe layer Journal of the European Optical Society-Rapid Publications silicon germanium grating out-coupler long device broad-band lidar applications |
| title | High-efficiency broadband grating out-coupler for thick silicon waveguides with a tuned SiGe layer |
| title_full | High-efficiency broadband grating out-coupler for thick silicon waveguides with a tuned SiGe layer |
| title_fullStr | High-efficiency broadband grating out-coupler for thick silicon waveguides with a tuned SiGe layer |
| title_full_unstemmed | High-efficiency broadband grating out-coupler for thick silicon waveguides with a tuned SiGe layer |
| title_short | High-efficiency broadband grating out-coupler for thick silicon waveguides with a tuned SiGe layer |
| title_sort | high efficiency broadband grating out coupler for thick silicon waveguides with a tuned sige layer |
| topic | silicon germanium grating out-coupler long device broad-band lidar applications |
| url | https://jeos.edpsciences.org/articles/jeos/full_html/2025/02/jeos20250032/jeos20250032.html |
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