Topological optical differentiator
| Autor: | Shanhui Fan, Tengfeng Zhu, Haiwen Wang, Cheng Guo, Junyi Huang, Meir Orenstein, Zhichao Ruan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Computer science
Science Nanophotonics Physics::Optics General Physics and Astronomy Optical computing Image processing Imaging techniques 02 engineering and technology Topology 01 natural sciences Article General Biochemistry Genetics and Molecular Biology 010309 optics Differentiator Optical physics Optical transfer function 0103 physical sciences Broadband Optical materials and structures Topological quantum number Multidisciplinary business.industry General Chemistry 021001 nanoscience & nanotechnology Publisher Correction Photonics 0210 nano-technology business Applied optics |
| Zdroj: | Nature Communications Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021) |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-021-20972-4 |
| Popis: | Optical computing holds significant promise of information processing with ultrahigh speed and low power consumption. Recent developments in nanophotonic structures have generated renewed interests due to the prospects of performing analog optical computing with compact devices. As one prominent example, spatial differentiation has been demonstrated with nanophotonic structures and directly applied for edge detection in image processing. However, broadband isotropic two-dimensional differentiation, which is required in most imaging processing applications, has not been experimentally demonstrated yet. Here, we establish a connection between two-dimensional optical spatial differentiation and a nontrivial topological charge in the optical transfer function. Based on this connection, we experimentally demonstrate an isotropic two-dimensional differentiation with a broad spectral bandwidth, by using the simplest photonic device, i.e. a single unpatterned interface. Our work indicates that exploiting concepts from topological photonics can lead to new opportunities in optical computing. Spatial differentiation is a form of optical computation which has applications in image processing. Here, the authors exploit nontrivial topological charges in the transfer function to realise broadband isotropic two-dimensional differentiation. |
| Databáze: | OpenAIRE |
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