Symmetry induced selective excitation of topological states in SSH waveguide arrays
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2022
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| _version_ | 1866909324482183168 |
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| author | Tang, Min Wang, Jiawei Valligatla, Sreeramulu Saggau, Christian N. Dong, Haiyun Naz, Ehsan Saei Ghareh Klembt, Sebastian Lee, Ching Hua Thomale, Ronny Brink, Jeroen van den Fulga, Ion Cosma Schmidt, Oliver G. Ma, Libo |
| author_facet | Tang, Min Wang, Jiawei Valligatla, Sreeramulu Saggau, Christian N. Dong, Haiyun Naz, Ehsan Saei Ghareh Klembt, Sebastian Lee, Ching Hua Thomale, Ronny Brink, Jeroen van den Fulga, Ion Cosma Schmidt, Oliver G. Ma, Libo |
| contents | The investigation of topological state transition in carefully designed photonic lattices is of high interest for fundamental research, as well as for applied studies such as manipulating light flow in on-chip photonic systems. Here, we report on topological phase transition between symmetric topological zero modes (TZM) and antisymmetric TZMs in Su-Schrieffer-Heeger (SSH) mirror symmetric waveguides. The transition of TZMs is realized by adjusting the coupling ratio between neighboring waveguide pairs, which is enabled by selective modulation of the refractive index in the waveguide gaps. Bi-directional topological transitions between symmetric and antisymmetric TZMs can be achieved with our proposed switching strategy. Selective excitation of topological edge mode is demonstrated owing to the symmetry characteristics of the TZMs. The flexible manipulation of topological states is promising for on-chip light flow control and may spark further investigations on symmetric/antisymmetric TZM transitions in other photonic topological frameworks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2211_06228 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Symmetry induced selective excitation of topological states in SSH waveguide arrays Tang, Min Wang, Jiawei Valligatla, Sreeramulu Saggau, Christian N. Dong, Haiyun Naz, Ehsan Saei Ghareh Klembt, Sebastian Lee, Ching Hua Thomale, Ronny Brink, Jeroen van den Fulga, Ion Cosma Schmidt, Oliver G. Ma, Libo Optics Other Condensed Matter The investigation of topological state transition in carefully designed photonic lattices is of high interest for fundamental research, as well as for applied studies such as manipulating light flow in on-chip photonic systems. Here, we report on topological phase transition between symmetric topological zero modes (TZM) and antisymmetric TZMs in Su-Schrieffer-Heeger (SSH) mirror symmetric waveguides. The transition of TZMs is realized by adjusting the coupling ratio between neighboring waveguide pairs, which is enabled by selective modulation of the refractive index in the waveguide gaps. Bi-directional topological transitions between symmetric and antisymmetric TZMs can be achieved with our proposed switching strategy. Selective excitation of topological edge mode is demonstrated owing to the symmetry characteristics of the TZMs. The flexible manipulation of topological states is promising for on-chip light flow control and may spark further investigations on symmetric/antisymmetric TZM transitions in other photonic topological frameworks. |
| title | Symmetry induced selective excitation of topological states in SSH waveguide arrays |
| topic | Optics Other Condensed Matter |
| url | https://arxiv.org/abs/2211.06228 |