Broadband near-infrared hyperbolic polaritons in MoOCl2

Yaolong Li (), Yuxin Zhang, Weizhe Zhang, Xiaofang Li, Jinglin Tang, Jingying Xiao, Guanyu Zhang, Xin Liao, Pengzuo Jiang, Qinyun Liu, Yijie Luo, Zini Cao, Qinghong Lyu, Yuanbiao Tong, Ruoxue Yang, Hong Yang, Quan Sun, Yunan Gao, Pan Wang, Zuxin Chen, Wenjing Liu (), Shufeng Wang (), Guowei Lyu (), Xiaoyong Hu (), Martin Aeschlimann () and Qihuang Gong ()
Additional contact information
Yaolong Li: Peking University
Yuxin Zhang: Peking University
Weizhe Zhang: Peking University
Xiaofang Li: Peking University
Jinglin Tang: Peking University
Jingying Xiao: Peking University
Guanyu Zhang: Peking University
Xin Liao: Peking University
Pengzuo Jiang: Peking University
Qinyun Liu: Peking University
Yijie Luo: Peking University
Zini Cao: Peking University
Qinghong Lyu: Peking University
Yuanbiao Tong: Zhejiang University
Ruoxue Yang: Zhejiang University
Hong Yang: Peking University
Quan Sun: Key Laboratory for Advanced Optoelectronic Integrated Chips of Jiangsu Province, Peking University Yangtze Delta Institute of Optoelectronics
Yunan Gao: Peking University
Pan Wang: Zhejiang University
Zuxin Chen: South China Normal University
Wenjing Liu: Peking University
Shufeng Wang: Peking University
Guowei Lyu: Peking University
Xiaoyong Hu: Peking University
Martin Aeschlimann: Department of Physics and Research Center OPTIMAS, RPTU University Kaiserslautern-Landau
Qihuang Gong: Peking University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Hyperbolic polaritons have drawn great attention in nanoscale light manipulation due to their unique properties. Currently, most studies focus on natural hyperbolic phonon materials in the mid-infrared, limiting their application in the visible to near-infrared range. Here, we present a work on broadband near-infrared hyperbolic plasmon polaritons in a van der Waals material MoOCl2 by a perturbation-free direct imaging technique of photoemission electron microscopy. In particular, the hyperbolic polariton behavior has been dynamically tailored and manipulated by wavelength, polarization, interlayer twist, and artificial structure, providing a reconfigurable platform for nanophotonic applications. Notably, the full iso-frequency contours can be reconstructed via polarization-selective excitations. Our work has contributed to hyperbolic materials in the broadband near-infrared with MoOCl2, and has revealed PEEM to be an ideal method for studying hyperbolic plasmon polaritons at the space-time limit.

Date: 2025
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DOI: 10.1038/s41467-025-61548-w

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