Cyclic Evolution of Synergized Spin and Orbital Angular Momenta
Abstract Spin angular momentum (SAM) and orbital angular momentum (OAM) are fundamental physical characteristics described by polarization and spatial degrees of freedom, respectively. Polarization is a feature of vector fields while spatial phase gradient determines the OAM ubiquitous to any scalar...
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Wiley
2025-01-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202409377 |
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| author | Lei Liu Xiao‐Chen Sun Yuan Tian Xiujuan Zhang Ming‐Hui Lu Yan‐Feng Chen |
| author_facet | Lei Liu Xiao‐Chen Sun Yuan Tian Xiujuan Zhang Ming‐Hui Lu Yan‐Feng Chen |
| author_sort | Lei Liu |
| collection | DOAJ |
| description | Abstract Spin angular momentum (SAM) and orbital angular momentum (OAM) are fundamental physical characteristics described by polarization and spatial degrees of freedom, respectively. Polarization is a feature of vector fields while spatial phase gradient determines the OAM ubiquitous to any scalar field. Common wisdom treats these two degrees of freedom as independent principles to manipulate wave propagations. Here, their synergy is demonstrated. This is achieved by introducing two orthogonal p‐orbitals as eigenbases, whose spatial modal features are exploited to generate OAM, and the associated orbital orientations provide means to simultaneously manipulate polarizations. Through periodic modulation and directional coupling, a full cyclic evolution of synchronized and synergized SAM‐OAM is realized. Remarkably, this evolution acquires a nontrivial geometric phase, leading to its representation on a Möbius strip. Experimentally, an acoustic cavity array is designed, whose dipole resonances precisely mimic the p‐orbitals, with pressure fields featuring the spatial characteristics and velocity fields the vectorial orientations. Based on this synergy, a spin‐orbital‐Hall effect is further showcased, highlighting the intricate locking of handedness, directionality, spin density, and spatial mode profile. This study unveils a fundamental connection between SAM and OAM, promising avenues for their novel applications in trapping, coding, and communications. |
| format | Article |
| id | doaj-art-2691285f89d44d5783d4937c6857d3c8 |
| institution | Kabale University |
| issn | 2198-3844 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
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| series | Advanced Science |
| spelling | doaj-art-2691285f89d44d5783d4937c6857d3c82025-01-20T13:04:18ZengWileyAdvanced Science2198-38442025-01-01123n/an/a10.1002/advs.202409377Cyclic Evolution of Synergized Spin and Orbital Angular MomentaLei Liu0Xiao‐Chen Sun1Yuan Tian2Xiujuan Zhang3Ming‐Hui Lu4Yan‐Feng Chen5National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering Nanjing University Nanjing 210093 ChinaNational Laboratory of Solid State Microstructures and Department of Materials Science and Engineering Nanjing University Nanjing 210093 ChinaNational Laboratory of Solid State Microstructures and Department of Materials Science and Engineering Nanjing University Nanjing 210093 ChinaNational Laboratory of Solid State Microstructures and Department of Materials Science and Engineering Nanjing University Nanjing 210093 ChinaNational Laboratory of Solid State Microstructures and Department of Materials Science and Engineering Nanjing University Nanjing 210093 ChinaNational Laboratory of Solid State Microstructures and Department of Materials Science and Engineering Nanjing University Nanjing 210093 ChinaAbstract Spin angular momentum (SAM) and orbital angular momentum (OAM) are fundamental physical characteristics described by polarization and spatial degrees of freedom, respectively. Polarization is a feature of vector fields while spatial phase gradient determines the OAM ubiquitous to any scalar field. Common wisdom treats these two degrees of freedom as independent principles to manipulate wave propagations. Here, their synergy is demonstrated. This is achieved by introducing two orthogonal p‐orbitals as eigenbases, whose spatial modal features are exploited to generate OAM, and the associated orbital orientations provide means to simultaneously manipulate polarizations. Through periodic modulation and directional coupling, a full cyclic evolution of synchronized and synergized SAM‐OAM is realized. Remarkably, this evolution acquires a nontrivial geometric phase, leading to its representation on a Möbius strip. Experimentally, an acoustic cavity array is designed, whose dipole resonances precisely mimic the p‐orbitals, with pressure fields featuring the spatial characteristics and velocity fields the vectorial orientations. Based on this synergy, a spin‐orbital‐Hall effect is further showcased, highlighting the intricate locking of handedness, directionality, spin density, and spatial mode profile. This study unveils a fundamental connection between SAM and OAM, promising avenues for their novel applications in trapping, coding, and communications.https://doi.org/10.1002/advs.202409377orbital angular momentumspin angular momentumtopology |
| spellingShingle | Lei Liu Xiao‐Chen Sun Yuan Tian Xiujuan Zhang Ming‐Hui Lu Yan‐Feng Chen Cyclic Evolution of Synergized Spin and Orbital Angular Momenta Advanced Science orbital angular momentum spin angular momentum topology |
| title | Cyclic Evolution of Synergized Spin and Orbital Angular Momenta |
| title_full | Cyclic Evolution of Synergized Spin and Orbital Angular Momenta |
| title_fullStr | Cyclic Evolution of Synergized Spin and Orbital Angular Momenta |
| title_full_unstemmed | Cyclic Evolution of Synergized Spin and Orbital Angular Momenta |
| title_short | Cyclic Evolution of Synergized Spin and Orbital Angular Momenta |
| title_sort | cyclic evolution of synergized spin and orbital angular momenta |
| topic | orbital angular momentum spin angular momentum topology |
| url | https://doi.org/10.1002/advs.202409377 |
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