DataVXAdvanced Optical MaterialsPaper
journal article·2024-07Open access

Topological broadband invisibility

Yuang Pan, Li Zhang, Xuan Chen, Fujia Chen, Ning Han, Qiaolu Chen, Hongsheng Chen, Yihao Yang

Advanced Optical Materials· Volume 12· Issue 21
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Source abstract

Abstract

Abstract When an electromagnetic wave is incident onto an object, the scattering from the object leads to its exposure. An invisibility cloak can bend the electromagnetic wave around the object with phase velocities exceeding the light speed in free space, which seems only possible over a narrow bandwidth, as manifested in the existing approaches, such as transformation optics and scattering cancellation. Here, it is experimentally demonstrated that this bandwidth limitation can be overcome by strategically positioning objects at topological nodes, characterized by minimal electromagnetic field amplitudes and indeterminate phases. This is accomplished using all‐dielectric photonic crystal slabs, which are engineered to exhibit a pair of topological nodes at fixed planes across an extensive bandwidth. This bandwidth expansion is facilitated not by resonance, but by the enforcement of mirror and time‐reversal symmetry. These findings thus introduce a novel topological paradigm for the broadband invisibility devices.
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Research context

OpenAlex topics: Metamaterials and Metasurfaces Applications · Orbital Angular Momentum in Optics · Photonic Crystals and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Extreme Photonics and Instrumentation ZJU‐Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 310027 China

International Joint Innovation Center The Electromagnetics Academy at Zhejiang University Zhejiang University Haining 314400 China

Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University Zhejiang University Jinhua 321099 China

Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing 312000 China

Funding

National Natural Science Foundation of China · Key Research and Development Program of Zhejiang Province · Fundamental Research Funds for the Central Universities · China Postdoctoral Science Foundation · Excellent Young Scientists Fund · Ministry of Science and Technology of the People's Republic of China

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