Study on unidirectional-emitting photonic-crystal lasers based on topological photonics
| Project/Area Number |
21F20356
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Review Section |
Basic Section 30020:Optical engineering and photon science-related
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| Research Institution | Kyoto University |
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Principal Investigator |
野田 進 京都大学, 工学研究科, 教授 (10208358)
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| Co-Investigator(Kenkyū-buntansha) |
YIN XUEFAN 京都大学, 工学研究科, 外国人特別研究員
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| Project Period (FY) |
2021-04-28 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2022: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2021: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Photonic crystal / Topology / Resonance |
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| Outline of Research at the Start |
Photonic-crystal surface-emitting lasers (PCSELs) have been attracting much attention since they are promising candidates for realizing single-mode high-power operation. The purpose of this research is to exploit the concept of topological photonics to further improve the performance of PCSELs.
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| Outline of Annual Research Achievements |
In 2022 year, first, I continued to improve the theory about the unidirectional guided resonances (UGRs). I established a new topological interpretation of UGRs in parameter space, which is consistent with the conventional topological charge picture, but may better clarify the physical origins and dynamic evolution of UGRs. Comparing to conventional topological charges picture, with this new interpretation, it's convenient to construct UGRs in parameter space, and their interplay with other radiation singularities in parameter space, such as exceptional points (EPs) and conventional band degeneracy is also discussed. Based on these, I updated the paper pre-printed in arXiv, and now it has been accepted by Physical Review Letter (Phys. Rev. Lett. 130, 056401)
Second, I found that, this topological physical interpretation of UGRs actually can also be applied to other amplitudes singularities in photonic crystals. For example, it can be used to describe the Bound states in continuum (BICs). Following the same strategy, I established a universal picture of BICs in whole momentum space. It is found that the definition of BICs can be extended even outside the lightcone, and all tunable BICs are actually resulted from the interband coupling of band inversion, including the accidental BICs and F-W BICs.
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| Research Progress Status |
令和4年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和4年度が最終年度であるため、記入しない。
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Report
(2 results)
Research Products
(5 results)
