Accurate dipole radiation model for waveguide grating couplers
An analytical theoretical model for the waveguide grating coupler is developed and applicable to practical deep gratings. The grating-assisted input coupling efficiency is calculated by considering the reciprocal out-coupling problem. The deep grating structure is modelled as an optical layer filled...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Results in Physics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379723003194 |
| _version_ | 1797814380196265984 |
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| author | Zhen Liu Mohamed A. Ettabib James S. Wilkinson Michalis N. Zervas |
| author_facet | Zhen Liu Mohamed A. Ettabib James S. Wilkinson Michalis N. Zervas |
| author_sort | Zhen Liu |
| collection | DOAJ |
| description | An analytical theoretical model for the waveguide grating coupler is developed and applicable to practical deep gratings. The grating-assisted input coupling efficiency is calculated by considering the reciprocal out-coupling problem. The deep grating structure is modelled as an optical layer filled with polarization dipole sources, and the scattered fields are then calculated using the associated Green’s functions and taking into account the multiple reflections and interference from the adjacent layers. The joint loss between the grating region and the waveguide is also considered. Comparison with numerical simulations shows very good agreement and validates the accuracy of the analytical model. The model explicitly describes the importance of multilayer interference of the scattered fields and guided-mode joint loss on the total grating-assisted coupling efficiency and can be used for practical waveguide grating coupler design with negligible computation workload. |
| first_indexed | 2024-03-13T08:06:50Z |
| format | Article |
| id | doaj.art-f8204b55a05d492baaba0e9345b266ed |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-03-13T08:06:50Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-f8204b55a05d492baaba0e9345b266ed2023-06-01T04:35:53ZengElsevierResults in Physics2211-37972023-06-0149106526Accurate dipole radiation model for waveguide grating couplersZhen Liu0Mohamed A. Ettabib1James S. Wilkinson2Michalis N. Zervas3Corresponding author.; Optoelectronics Research Centre, Zepler Institute for Photonics and Nanoelectronics, University of Southampton, Southampton SO17 1BJ, UKOptoelectronics Research Centre, Zepler Institute for Photonics and Nanoelectronics, University of Southampton, Southampton SO17 1BJ, UKOptoelectronics Research Centre, Zepler Institute for Photonics and Nanoelectronics, University of Southampton, Southampton SO17 1BJ, UKOptoelectronics Research Centre, Zepler Institute for Photonics and Nanoelectronics, University of Southampton, Southampton SO17 1BJ, UKAn analytical theoretical model for the waveguide grating coupler is developed and applicable to practical deep gratings. The grating-assisted input coupling efficiency is calculated by considering the reciprocal out-coupling problem. The deep grating structure is modelled as an optical layer filled with polarization dipole sources, and the scattered fields are then calculated using the associated Green’s functions and taking into account the multiple reflections and interference from the adjacent layers. The joint loss between the grating region and the waveguide is also considered. Comparison with numerical simulations shows very good agreement and validates the accuracy of the analytical model. The model explicitly describes the importance of multilayer interference of the scattered fields and guided-mode joint loss on the total grating-assisted coupling efficiency and can be used for practical waveguide grating coupler design with negligible computation workload.http://www.sciencedirect.com/science/article/pii/S2211379723003194Waveguide grating couplerMultilayer interferenceDipole radiationCoupling efficiencyGuided mode |
| spellingShingle | Zhen Liu Mohamed A. Ettabib James S. Wilkinson Michalis N. Zervas Accurate dipole radiation model for waveguide grating couplers Results in Physics Waveguide grating coupler Multilayer interference Dipole radiation Coupling efficiency Guided mode |
| title | Accurate dipole radiation model for waveguide grating couplers |
| title_full | Accurate dipole radiation model for waveguide grating couplers |
| title_fullStr | Accurate dipole radiation model for waveguide grating couplers |
| title_full_unstemmed | Accurate dipole radiation model for waveguide grating couplers |
| title_short | Accurate dipole radiation model for waveguide grating couplers |
| title_sort | accurate dipole radiation model for waveguide grating couplers |
| topic | Waveguide grating coupler Multilayer interference Dipole radiation Coupling efficiency Guided mode |
| url | http://www.sciencedirect.com/science/article/pii/S2211379723003194 |
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