Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry
Microring resonators made of materials with a zinc-blend or diamond lattice allow exploiting their 4-bar symmetry to achieve quasi-phase matching condition for second-order optical nonlinearities. However, fabrication tolerances impose severe limits on the quasi-phase matching condition, which in tu...
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MDPI AG
2020-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/24/9047 |
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| author | Pierre Guillemé Chiara Vecchi Claudio Castellan Stefano Signorini Mher Ghulinyan Martino Bernard Maria Parisi Lorenzo Pavesi |
| author_facet | Pierre Guillemé Chiara Vecchi Claudio Castellan Stefano Signorini Mher Ghulinyan Martino Bernard Maria Parisi Lorenzo Pavesi |
| author_sort | Pierre Guillemé |
| collection | DOAJ |
| description | Microring resonators made of materials with a zinc-blend or diamond lattice allow exploiting their 4-bar symmetry to achieve quasi-phase matching condition for second-order optical nonlinearities. However, fabrication tolerances impose severe limits on the quasi-phase matching condition, which in turn degrades the generation efficiency. Here, we present a method to mitigate these limitations. As an example, we studied the geometry and the pump wavelength conditions to induce the second-harmonic generation in silicon-based microrings with a second-order susceptibility <inline-formula><math display="inline"><semantics><mrow><msubsup><mi>χ</mi><mrow><mi>z</mi><mi>x</mi><mi>y</mi></mrow><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow></msubsup><mo>≠</mo><mn>0</mn></mrow></semantics></math></inline-formula>. We found the best compromises between performances and experimental requirements, and we unveil a strategy to minimize the impacts of fabrication defects. The method can be easily transferred to other material systems. |
| first_indexed | 2024-03-10T13:59:23Z |
| format | Article |
| id | doaj.art-b7e2e78e59bd45689d1fdcfc68222bbc |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T13:59:23Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-b7e2e78e59bd45689d1fdcfc68222bbc2023-11-21T01:21:28ZengMDPI AGApplied Sciences2076-34172020-12-011024904710.3390/app10249047Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar SymmetryPierre Guillemé0Chiara Vecchi1Claudio Castellan2Stefano Signorini3Mher Ghulinyan4Martino Bernard5Maria Parisi6Lorenzo Pavesi7Nanoscience Laboratory, Departement of Physics, University of Trento, Via Sommarive 14, 38123 Povo, Trento, ItalyNanoscience Laboratory, Departement of Physics, University of Trento, Via Sommarive 14, 38123 Povo, Trento, ItalyNanoscience Laboratory, Departement of Physics, University of Trento, Via Sommarive 14, 38123 Povo, Trento, ItalyNanoscience Laboratory, Departement of Physics, University of Trento, Via Sommarive 14, 38123 Povo, Trento, ItalyCentre for Materials and Microsystems, Fondazione Bruno Kessler, Via Sommarive 18, 38123 Povo, Trento, ItalyCentre for Materials and Microsystems, Fondazione Bruno Kessler, Via Sommarive 18, 38123 Povo, Trento, ItalyCNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, 80078 Pozzuoli (NA), ItalyNanoscience Laboratory, Departement of Physics, University of Trento, Via Sommarive 14, 38123 Povo, Trento, ItalyMicroring resonators made of materials with a zinc-blend or diamond lattice allow exploiting their 4-bar symmetry to achieve quasi-phase matching condition for second-order optical nonlinearities. However, fabrication tolerances impose severe limits on the quasi-phase matching condition, which in turn degrades the generation efficiency. Here, we present a method to mitigate these limitations. As an example, we studied the geometry and the pump wavelength conditions to induce the second-harmonic generation in silicon-based microrings with a second-order susceptibility <inline-formula><math display="inline"><semantics><mrow><msubsup><mi>χ</mi><mrow><mi>z</mi><mi>x</mi><mi>y</mi></mrow><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow></msubsup><mo>≠</mo><mn>0</mn></mrow></semantics></math></inline-formula>. We found the best compromises between performances and experimental requirements, and we unveil a strategy to minimize the impacts of fabrication defects. The method can be easily transferred to other material systems.https://www.mdpi.com/2076-3417/10/24/9047microringssecond harmonic generationoptical frequency combs |
| spellingShingle | Pierre Guillemé Chiara Vecchi Claudio Castellan Stefano Signorini Mher Ghulinyan Martino Bernard Maria Parisi Lorenzo Pavesi Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry Applied Sciences microrings second harmonic generation optical frequency combs |
| title | Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry |
| title_full | Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry |
| title_fullStr | Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry |
| title_full_unstemmed | Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry |
| title_short | Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry |
| title_sort | robust geometries for second harmonic generation in microrings exhibiting a 4 bar symmetry |
| topic | microrings second harmonic generation optical frequency combs |
| url | https://www.mdpi.com/2076-3417/10/24/9047 |
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