Projects per year
Abstract
The Chern number has been widely used to describe the topological properties of periodic structures in momentum space. Here, we introduce a real-space spin Chern number for the optical near fields of finite-sized structures. This new spin Chern number is intrinsically quantized and equal to the structure's Euler characteristic. The relationship is robust against continuous deformation of the structure's geometry and is irrelevant to the specific material constituents or external excitation. Our Letter enriches topological physics by extending the Chern number to real space, opening exciting possibilities for exploring the real-space topological properties of light. © 2024 American Physical Society
| Original language | English |
|---|---|
| Article number | 233801 |
| Journal | Physical Review Letters |
| Volume | 132 |
| Issue number | 23 |
| Online published | 7 Jun 2024 |
| DOIs | |
| Publication status | Published - 7 Jun 2024 |
Funding
The work described in this Letter was supported by grants from the Research Grants Council of the Hong Kong Special Administrative Region, China (CityU 11306019 and AoE/P-502/20) and the National Natural Science Foundation of China (No. 12322416 and No. 11904306).
Publisher's Copyright Statement
- COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: Fu, T., Zhang, R.-Y., Jia, S., Chan, C. T., & Wang, S. (2024). Near-Field Spin Chern Number Quantized by Real-Space Topology of Optical Structures. Physical Review Letters, 132(23), Article 233801. https://doi.org/10.1103/PhysRevLett.132.233801 The copyright of this article is owned by American Physical Society.
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AoE(UGC): Meta-optics, Meta-acoustics and Meta-device
TSAI, D.-P. (Principal Investigator / Project Coordinator), CHAN, C. T. (Co-Principal Investigator), LI, J. T. H. (Co-Principal Investigator), SHENG, P. (Co-Principal Investigator), WANG, S. (Co-Principal Investigator), Zhang, S. (Co-Principal Investigator), Zhu, J. (Co-Principal Investigator), PENDRY, J. (Co-Investigator) & Tanaka, T. (Co-Investigator)
1/05/21 → …
Project: Research
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GRF: Theoretical Study of Photonic Spin-Orbit Interactions Mediated by Topological Scatterers
WANG, S. (Principal Investigator / Project Coordinator)
1/01/20 → 20/12/23
Project: Research