Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators
Abstract Exceptional points (EPs) have been extensively explored in mechanical, acoustic, plasmonic, and photonic systems. However, little is known about the role of EPs in tailoring the dynamic tunability of optical devices. A specific type of EPs known as chiral EPs has recently attracted much att...
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| Format: | Article |
| Language: | English |
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Nature Publishing Group
2025-01-01
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| Series: | Light: Science & Applications |
| Online Access: | https://doi.org/10.1038/s41377-024-01686-w |
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| author | Hwaseob Lee Lorry Chang Ali Kecebas Dun Mao Yahui Xiao Tiantian Li Andrea Alù Sahin K. Özdemir Tingyi Gu |
| author_facet | Hwaseob Lee Lorry Chang Ali Kecebas Dun Mao Yahui Xiao Tiantian Li Andrea Alù Sahin K. Özdemir Tingyi Gu |
| author_sort | Hwaseob Lee |
| collection | DOAJ |
| description | Abstract Exceptional points (EPs) have been extensively explored in mechanical, acoustic, plasmonic, and photonic systems. However, little is known about the role of EPs in tailoring the dynamic tunability of optical devices. A specific type of EPs known as chiral EPs has recently attracted much attention for controlling the flow of light and for building sensors with better responsivity. A recently demonstrated route to chiral EPs via lithographically defined symmetric Mie scatterers on the rim of resonators has not only provided the much-needed mechanical stability for studying chiral EPs, but also helped reduce losses originating from nanofabrication imperfections, facilitating the in-situ study of chiral EPs and their contribution to the dynamics and tunability of resonators. Here, we use asymmetric Mie scatterers to break the rotational symmetry of a microresonator, to demonstrate deterministic thermal tuning across a chiral EP, and to demonstrate EP-mediated chiral optical nonlinear response and efficient electro-optic tuning. Our results indicate asymmetric electro-optic modulation with up to 17 dB contrast at GHz and CMOS-compatible voltage levels. Such wafer-scale nano-manufacturing of chiral electro-optic modulators and the chiral EP-tailored tunning may facilitate new micro-resonator functionalities in quantum information processing, electromagnetic wave control, and optical interconnects. |
| format | Article |
| id | doaj-art-4e82b5e4604e48e6a8578cd7cd3e6e1f |
| institution | Kabale University |
| issn | 2047-7538 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Publishing Group |
| record_format | Article |
| series | Light: Science & Applications |
| spelling | doaj-art-4e82b5e4604e48e6a8578cd7cd3e6e1f2025-01-12T12:40:25ZengNature Publishing GroupLight: Science & Applications2047-75382025-01-0114111010.1038/s41377-024-01686-wChiral exceptional point enhanced active tuning and nonreciprocity in micro-resonatorsHwaseob Lee0Lorry Chang1Ali Kecebas2Dun Mao3Yahui Xiao4Tiantian Li5Andrea Alù6Sahin K. Özdemir7Tingyi Gu8Department of Electrical and Computer Engineering, University of DelawareDepartment of Electrical and Computer Engineering, University of DelawareDepartment of Engineering Science and Mechanics, Pennsylvania State UniversityDepartment of Electrical and Computer Engineering, University of DelawareDepartment of Electrical and Computer Engineering, University of DelawareDepartment of Electrical and Computer Engineering, University of DelawarePhotonics Initiative, Advanced Science Research Center, City University of New YorkDepartment of Engineering Science and Mechanics, Pennsylvania State UniversityDepartment of Electrical and Computer Engineering, University of DelawareAbstract Exceptional points (EPs) have been extensively explored in mechanical, acoustic, plasmonic, and photonic systems. However, little is known about the role of EPs in tailoring the dynamic tunability of optical devices. A specific type of EPs known as chiral EPs has recently attracted much attention for controlling the flow of light and for building sensors with better responsivity. A recently demonstrated route to chiral EPs via lithographically defined symmetric Mie scatterers on the rim of resonators has not only provided the much-needed mechanical stability for studying chiral EPs, but also helped reduce losses originating from nanofabrication imperfections, facilitating the in-situ study of chiral EPs and their contribution to the dynamics and tunability of resonators. Here, we use asymmetric Mie scatterers to break the rotational symmetry of a microresonator, to demonstrate deterministic thermal tuning across a chiral EP, and to demonstrate EP-mediated chiral optical nonlinear response and efficient electro-optic tuning. Our results indicate asymmetric electro-optic modulation with up to 17 dB contrast at GHz and CMOS-compatible voltage levels. Such wafer-scale nano-manufacturing of chiral electro-optic modulators and the chiral EP-tailored tunning may facilitate new micro-resonator functionalities in quantum information processing, electromagnetic wave control, and optical interconnects.https://doi.org/10.1038/s41377-024-01686-w |
| spellingShingle | Hwaseob Lee Lorry Chang Ali Kecebas Dun Mao Yahui Xiao Tiantian Li Andrea Alù Sahin K. Özdemir Tingyi Gu Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators Light: Science & Applications |
| title | Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators |
| title_full | Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators |
| title_fullStr | Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators |
| title_full_unstemmed | Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators |
| title_short | Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators |
| title_sort | chiral exceptional point enhanced active tuning and nonreciprocity in micro resonators |
| url | https://doi.org/10.1038/s41377-024-01686-w |
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