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Topological optical differentiator.

Tengfeng Zhu, Cheng Guo, Junyi Huang, Haiwen Wang, Meir Orenstein, Zhichao Ruan, Shanhui Fan

Author Information

Tengfeng Zhu: Department of Electrical Engineering, Ginzton Laboratory, Stanford University, Stanford, CA, USA.
Cheng Guo: Department of Electrical Engineering, Ginzton Laboratory, Stanford University, Stanford, CA, USA. ORCID
Junyi Huang: Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou, China.
Haiwen Wang: Department of Electrical Engineering, Ginzton Laboratory, Stanford University, Stanford, CA, USA.
Meir Orenstein: Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa, Israel.
Zhichao Ruan: Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou, China. zhichao@zju.edu.cn. ORCID
Shanhui Fan: Department of Electrical Engineering, Ginzton Laboratory, Stanford University, Stanford, CA, USA. shanhui@stanford.edu. ORCID

PMID: 33514708 DOI: 10.1038/s41467-021-20972-4

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.

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201906320169/China Scholarship Council (CSC)
91850108/National Natural Science Foundation of China (National Science Foundation of China)
61675179/National Natural Science Foundation of China (National Science Foundation of China)
FA9550-17-1-0002/United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research (AF Office of Scientific Research)
N00014-20-1-2450/United States Department of Defense | United States Navy | Office of Naval Research (ONR)

Journal Article

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