Freeform thin-film lithium niobate mode converter for photon-pair generation
Thin-film lithium niobate (TFLN) has emerged as a promising platform for integrated photonics due to its exceptional material properties. The application of freeform topology optimization to TFLN devices enables the realization of compact designs with complex functionalities and high efficiency. How...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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De Gruyter
2025-02-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2024-0515 |
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| _version_ | 1850100466573115392 |
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| author | Kim Changhyun Bae Munseong Choi Minho Lee Sangbin Lee Myunghoo Kim Chihyeon Jung Hojoong Chung Haejun Kwon Hyounghan |
| author_facet | Kim Changhyun Bae Munseong Choi Minho Lee Sangbin Lee Myunghoo Kim Chihyeon Jung Hojoong Chung Haejun Kwon Hyounghan |
| author_sort | Kim Changhyun |
| collection | DOAJ |
| description | Thin-film lithium niobate (TFLN) has emerged as a promising platform for integrated photonics due to its exceptional material properties. The application of freeform topology optimization to TFLN devices enables the realization of compact designs with complex functionalities and high efficiency. However, the stringent fabrication constraints of TFLN present significant challenges for optimization, particularly in nonlinear photonic devices. In this work, we propose an inverse design methodology that successfully addresses these challenges and demonstrates the development of an efficient freeform TFLN mode converter. The numerically optimized mode converter achieves a transmission efficiency of 67.60 % and a mode purity of 84.58 %. Experimental validation through nonlinear processes, including second harmonic generation and spontaneous parametric down-conversion, shows that the fabricated devices improve the efficiency of these processes by factors of two and three, respectively, compared to devices without freeform designs. The proposed inverse design framework provides a powerful tool for advancing the development of TFLN-based devices, with broad applicability to nonlinear and quantum photonics. |
| format | Article |
| id | doaj-art-77d7f063ddcd4cc8991a472593cff492 |
| institution | DOAJ |
| issn | 2192-8614 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-77d7f063ddcd4cc8991a472593cff4922025-08-20T02:40:18ZengDe GruyterNanophotonics2192-86142025-02-0114111949196010.1515/nanoph-2024-0515Freeform thin-film lithium niobate mode converter for photon-pair generationKim Changhyun0Bae Munseong1Choi Minho2Lee Sangbin3Lee Myunghoo4Kim Chihyeon5Jung Hojoong6Chung Haejun7Kwon Hyounghan8Center for Quantum Technology, 58975Korea Institute of Science and Technology (KIST), Seoul02792, South KoreaDepartment of Electronic Engineering, Hanyang University, Seoul, 04763, South KoreaCenter for Quantum Technology, 58975Korea Institute of Science and Technology (KIST), Seoul02792, South KoreaDepartment of Artificial Intelligence Semiconductor Engineering, Hanyang University, Seoul, 04763, South KoreaDepartment of Electrical and Computer Engineering, University of Washington, Seattle, WA, 98195, USADepartment of Electronic Engineering, Hanyang University, Seoul, 04763, South KoreaCenter for Quantum Technology, 58975Korea Institute of Science and Technology (KIST), Seoul02792, South KoreaDepartment of Electronic Engineering, Department of Artificial Intelligence, and Department of Artificial Intelligence Semiconductor Engineering, Hanyang University, Seoul, 04763, South KoreaCenter for Quantum Technology, 58975Korea Institute of Science and Technology (KIST), Seoul02792, South KoreaThin-film lithium niobate (TFLN) has emerged as a promising platform for integrated photonics due to its exceptional material properties. The application of freeform topology optimization to TFLN devices enables the realization of compact designs with complex functionalities and high efficiency. However, the stringent fabrication constraints of TFLN present significant challenges for optimization, particularly in nonlinear photonic devices. In this work, we propose an inverse design methodology that successfully addresses these challenges and demonstrates the development of an efficient freeform TFLN mode converter. The numerically optimized mode converter achieves a transmission efficiency of 67.60 % and a mode purity of 84.58 %. Experimental validation through nonlinear processes, including second harmonic generation and spontaneous parametric down-conversion, shows that the fabricated devices improve the efficiency of these processes by factors of two and three, respectively, compared to devices without freeform designs. The proposed inverse design framework provides a powerful tool for advancing the development of TFLN-based devices, with broad applicability to nonlinear and quantum photonics.https://doi.org/10.1515/nanoph-2024-0515lithium niobatemode converterinverse designtopology optimizationspontaneous parametric down conversion |
| spellingShingle | Kim Changhyun Bae Munseong Choi Minho Lee Sangbin Lee Myunghoo Kim Chihyeon Jung Hojoong Chung Haejun Kwon Hyounghan Freeform thin-film lithium niobate mode converter for photon-pair generation Nanophotonics lithium niobate mode converter inverse design topology optimization spontaneous parametric down conversion |
| title | Freeform thin-film lithium niobate mode converter for photon-pair generation |
| title_full | Freeform thin-film lithium niobate mode converter for photon-pair generation |
| title_fullStr | Freeform thin-film lithium niobate mode converter for photon-pair generation |
| title_full_unstemmed | Freeform thin-film lithium niobate mode converter for photon-pair generation |
| title_short | Freeform thin-film lithium niobate mode converter for photon-pair generation |
| title_sort | freeform thin film lithium niobate mode converter for photon pair generation |
| topic | lithium niobate mode converter inverse design topology optimization spontaneous parametric down conversion |
| url | https://doi.org/10.1515/nanoph-2024-0515 |
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