Complete asymmetric polarization conversion at zero-eigenvalue exceptional points of non-Hermitian metasurfaces
Non-Hermitian systems can be tuned to exhibit exceptional points, where both eigenvalues and eigenstates coalesce concurrently. The inherent adaptability of photonic non-Hermitian systems in configuring gain and loss has allowed us to observe a plethora of counterintuitive phenomena, largely as a co...
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| Format: | Article |
| Language: | English |
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De Gruyter
2024-10-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2024-0391 |
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| author | Oh Donghak Baek Soojeong Lee Sangha Lee Kyungmin Park Jagang Liu Zhaowei Kim Teun-Teun Min Bumki |
| author_facet | Oh Donghak Baek Soojeong Lee Sangha Lee Kyungmin Park Jagang Liu Zhaowei Kim Teun-Teun Min Bumki |
| author_sort | Oh Donghak |
| collection | DOAJ |
| description | Non-Hermitian systems can be tuned to exhibit exceptional points, where both eigenvalues and eigenstates coalesce concurrently. The inherent adaptability of photonic non-Hermitian systems in configuring gain and loss has allowed us to observe a plethora of counterintuitive phenomena, largely as a consequence of the eigenspace reduction at these exceptional points. In this work, we propose a non-Hermitian metasurface that, through the incorporation of gain, enables complete asymmetric polarization conversion at an exceptional point with a zero eigenvalue. Specifically, we provide numerical evidence for this concept by designing a non-Hermitian metasurface that facilitates polarization conversion from right to left circular polarization, while preventing conversion in the reverse direction and co-polarized transmission. Furthermore, our investigation reveals that this specific form of complete asymmetric polarization conversion results in maximum circular dichroism in transmission, thereby eliminating the need for external chirality or three-dimensional helical structures. This non-Hermitian technique offers an intriguing approach to designing polarization-sensitive optical devices and systems, further expanding their functionalities and capabilities. |
| format | Article |
| id | doaj-art-1ca3a1203a0042f7b589cae14a96f84a |
| institution | Kabale University |
| issn | 2192-8614 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-1ca3a1203a0042f7b589cae14a96f84a2025-02-10T13:24:47ZengDe GruyterNanophotonics2192-86142024-10-0113244409441610.1515/nanoph-2024-0391Complete asymmetric polarization conversion at zero-eigenvalue exceptional points of non-Hermitian metasurfacesOh Donghak0Baek Soojeong1Lee Sangha2Lee Kyungmin3Park Jagang4Liu Zhaowei5Kim Teun-Teun6Min Bumki7Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon305-751, Republic of KoreaDepartment of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon305-751, Republic of KoreaDepartment of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon305-751, Republic of KoreaDepartment of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon305-751, Republic of KoreaDepartment of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA, USADepartment of Electrical and Computer Engineering,University of California, San Diego, 9500 Gilman Drive, La Jolla, CA92093, USADepartment of Physics, 35029University of Ulsan, Ulsan44610, Republic of KoreaDepartment of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon305-751, Republic of KoreaNon-Hermitian systems can be tuned to exhibit exceptional points, where both eigenvalues and eigenstates coalesce concurrently. The inherent adaptability of photonic non-Hermitian systems in configuring gain and loss has allowed us to observe a plethora of counterintuitive phenomena, largely as a consequence of the eigenspace reduction at these exceptional points. In this work, we propose a non-Hermitian metasurface that, through the incorporation of gain, enables complete asymmetric polarization conversion at an exceptional point with a zero eigenvalue. Specifically, we provide numerical evidence for this concept by designing a non-Hermitian metasurface that facilitates polarization conversion from right to left circular polarization, while preventing conversion in the reverse direction and co-polarized transmission. Furthermore, our investigation reveals that this specific form of complete asymmetric polarization conversion results in maximum circular dichroism in transmission, thereby eliminating the need for external chirality or three-dimensional helical structures. This non-Hermitian technique offers an intriguing approach to designing polarization-sensitive optical devices and systems, further expanding their functionalities and capabilities.https://doi.org/10.1515/nanoph-2024-0391non-hermitian metasurfacesexceptional pointspolarization conversiongain-incorporated metasurfacecircular dichroism |
| spellingShingle | Oh Donghak Baek Soojeong Lee Sangha Lee Kyungmin Park Jagang Liu Zhaowei Kim Teun-Teun Min Bumki Complete asymmetric polarization conversion at zero-eigenvalue exceptional points of non-Hermitian metasurfaces Nanophotonics non-hermitian metasurfaces exceptional points polarization conversion gain-incorporated metasurface circular dichroism |
| title | Complete asymmetric polarization conversion at zero-eigenvalue exceptional points of non-Hermitian metasurfaces |
| title_full | Complete asymmetric polarization conversion at zero-eigenvalue exceptional points of non-Hermitian metasurfaces |
| title_fullStr | Complete asymmetric polarization conversion at zero-eigenvalue exceptional points of non-Hermitian metasurfaces |
| title_full_unstemmed | Complete asymmetric polarization conversion at zero-eigenvalue exceptional points of non-Hermitian metasurfaces |
| title_short | Complete asymmetric polarization conversion at zero-eigenvalue exceptional points of non-Hermitian metasurfaces |
| title_sort | complete asymmetric polarization conversion at zero eigenvalue exceptional points of non hermitian metasurfaces |
| topic | non-hermitian metasurfaces exceptional points polarization conversion gain-incorporated metasurface circular dichroism |
| url | https://doi.org/10.1515/nanoph-2024-0391 |
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