High transmission in 120-degree sharp bends of inversion-symmetric and inversion-asymmetric photonic crystal waveguides
Abstract Bending loss is one of the serious problems for constructing nanophotonic integrated circuits. Recently, many works reported that valley photonic crystals (VPhCs) enable significantly high transmission via 120-degree sharp bends. However, it is unclear whether the high bend-transmission res...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-01-01
|
| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-025-56020-8 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832594540055232512 |
|---|---|
| author | Wei Dai Taiki Yoda Yuto Moritake Masaaki Ono Eiichi Kuramochi Masaya Notomi |
| author_facet | Wei Dai Taiki Yoda Yuto Moritake Masaaki Ono Eiichi Kuramochi Masaya Notomi |
| author_sort | Wei Dai |
| collection | DOAJ |
| description | Abstract Bending loss is one of the serious problems for constructing nanophotonic integrated circuits. Recently, many works reported that valley photonic crystals (VPhCs) enable significantly high transmission via 120-degree sharp bends. However, it is unclear whether the high bend-transmission results directly from the valley-photonic effects, which are based on the breaking of inversion symmetry. In this study, we conduct a series of comparative numerical and experimental investigations of bend-transmission in various triangular PhCs with and without inversion symmetry and reveal that the high bend-transmission is solely determined by the domain-wall configuration and independent of the existence of the inversion symmetry. Preliminary analysis of the polarization distribution indicates that high bend-transmissions are closely related to the appearance of local topological polarization singularities near the bending section. Our work demonstrates that high transmission can be achieved in a much wider family of PhC waveguides, which may provide novel designs for low-loss nanophotonic integrated circuits with enhanced flexibility and a new understanding of the nature of valley-photonics. |
| format | Article |
| id | doaj-art-309eb240a73546299751e1e080b789a7 |
| institution | Kabale University |
| issn | 2041-1723 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj-art-309eb240a73546299751e1e080b789a72025-01-19T12:32:22ZengNature PortfolioNature Communications2041-17232025-01-0116111210.1038/s41467-025-56020-8High transmission in 120-degree sharp bends of inversion-symmetric and inversion-asymmetric photonic crystal waveguidesWei Dai0Taiki Yoda1Yuto Moritake2Masaaki Ono3Eiichi Kuramochi4Masaya Notomi5Department of Physics, Tokyo Institute of TechnologyDepartment of Physics, Tokyo Institute of TechnologyDepartment of Physics, Tokyo Institute of TechnologyNTT Basic Research Laboratories, NTT CorporationNTT Basic Research Laboratories, NTT CorporationDepartment of Physics, Tokyo Institute of TechnologyAbstract Bending loss is one of the serious problems for constructing nanophotonic integrated circuits. Recently, many works reported that valley photonic crystals (VPhCs) enable significantly high transmission via 120-degree sharp bends. However, it is unclear whether the high bend-transmission results directly from the valley-photonic effects, which are based on the breaking of inversion symmetry. In this study, we conduct a series of comparative numerical and experimental investigations of bend-transmission in various triangular PhCs with and without inversion symmetry and reveal that the high bend-transmission is solely determined by the domain-wall configuration and independent of the existence of the inversion symmetry. Preliminary analysis of the polarization distribution indicates that high bend-transmissions are closely related to the appearance of local topological polarization singularities near the bending section. Our work demonstrates that high transmission can be achieved in a much wider family of PhC waveguides, which may provide novel designs for low-loss nanophotonic integrated circuits with enhanced flexibility and a new understanding of the nature of valley-photonics.https://doi.org/10.1038/s41467-025-56020-8 |
| spellingShingle | Wei Dai Taiki Yoda Yuto Moritake Masaaki Ono Eiichi Kuramochi Masaya Notomi High transmission in 120-degree sharp bends of inversion-symmetric and inversion-asymmetric photonic crystal waveguides Nature Communications |
| title | High transmission in 120-degree sharp bends of inversion-symmetric and inversion-asymmetric photonic crystal waveguides |
| title_full | High transmission in 120-degree sharp bends of inversion-symmetric and inversion-asymmetric photonic crystal waveguides |
| title_fullStr | High transmission in 120-degree sharp bends of inversion-symmetric and inversion-asymmetric photonic crystal waveguides |
| title_full_unstemmed | High transmission in 120-degree sharp bends of inversion-symmetric and inversion-asymmetric photonic crystal waveguides |
| title_short | High transmission in 120-degree sharp bends of inversion-symmetric and inversion-asymmetric photonic crystal waveguides |
| title_sort | high transmission in 120 degree sharp bends of inversion symmetric and inversion asymmetric photonic crystal waveguides |
| url | https://doi.org/10.1038/s41467-025-56020-8 |
| work_keys_str_mv | AT weidai hightransmissionin120degreesharpbendsofinversionsymmetricandinversionasymmetricphotoniccrystalwaveguides AT taikiyoda hightransmissionin120degreesharpbendsofinversionsymmetricandinversionasymmetricphotoniccrystalwaveguides AT yutomoritake hightransmissionin120degreesharpbendsofinversionsymmetricandinversionasymmetricphotoniccrystalwaveguides AT masaakiono hightransmissionin120degreesharpbendsofinversionsymmetricandinversionasymmetricphotoniccrystalwaveguides AT eiichikuramochi hightransmissionin120degreesharpbendsofinversionsymmetricandinversionasymmetricphotoniccrystalwaveguides AT masayanotomi hightransmissionin120degreesharpbendsofinversionsymmetricandinversionasymmetricphotoniccrystalwaveguides |