Nonreciprocal propagation in a non-Hermitian silicon photonic coupler employing graphene saturable absorption
We present the concept, analysis and design of a nonreciprocal system of coupled nonlinear waveguides, operating at the near infrared. We exploit the spatial asymmetry induced by the exceptional points of a non-Hermitian coupler which, combined with saturable absorption in the nonlinear regime, can...
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| Published in | EPJ Web of conferences Vol. 238; p. 11006 |
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| Main Authors | , , , |
| Format | Journal Article Conference Proceeding |
| Language | English |
| Published |
Les Ulis
EDP Sciences
2020
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| Subjects | |
| Online Access | Get full text |
| ISSN | 2100-014X 2101-6275 2100-014X |
| DOI | 10.1051/epjconf/202023811006 |
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| Abstract | We present the concept, analysis and design of a nonreciprocal system of coupled nonlinear waveguides, operating at the near infrared. We exploit the spatial asymmetry induced by the exceptional points of a non-Hermitian coupler which, combined with saturable absorption in the nonlinear regime, can break Lorentz reciprocity. In this work, we introduce asymmetric losses in a pair of coupled silicon waveguides by overlaying only one of them with unbiased graphene, subject to saturable absorption. The device can be used as a broadband half-duplex isolator: a two-port component offering unidirectional transmission of high-power signals. |
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| AbstractList | We present the concept, analysis and design of a nonreciprocal system of coupled nonlinear waveguides, operating at the near infrared. We exploit the spatial asymmetry induced by the exceptional points of a non-Hermitian coupler which, combined with saturable absorption in the nonlinear regime, can break Lorentz reciprocity. In this work, we introduce asymmetric losses in a pair of coupled silicon waveguides by overlaying only one of them with unbiased graphene, subject to saturable absorption. The device can be used as a broadband half-duplex isolator: a two-port component offering unidirectional transmission of high-power signals. |
| Author | Yioultsis, Traianos Chatzidimitriou, Dimitrios Pitilakis, Alexandros Kriezis, Emmanouil |
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| Cites_doi | 10.1103/PhysRevB.97.115431 10.1364/JOSAB.35.001525 10.1063/1.4926501 10.1126/science.aar7709 |
| ContentType | Journal Article Conference Proceeding |
| Copyright | 2020. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and conditions, you may use this content in accordance with the terms of the License. |
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| DOI | 10.1051/epjconf/202023811006 |
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| SubjectTerms | Absorption Asymmetry Broadband Couplers Graphene Reciprocity Silicon Waveguides |
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| Title | Nonreciprocal propagation in a non-Hermitian silicon photonic coupler employing graphene saturable absorption |
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