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research article

Disorder-assisted real–momentum topological photonic crystal

Qin, Haoye  
•
Su, Zengping
•
Zhang, Zhe  
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February 26, 2025
Nature

Topological defects and disorder counteract each other. Intuitively, disorder is considered detrimental, requiring efforts to mitigate its effects in conventional topological photonics. We propose a counter-intuitive approach that exploits a real–momentum topological photonic crystal that harnesses real-space disorder to generate a Pancharatnam–Berry phase without disrupting the momentum-space singularity originating from bound states in the continuum. This methodology allows flat optical devices to encode spatial information or even extra topological charge in real space while preserving the topology of bound states in the continuum in momentum space with inherent alignment. Here, as a proof of concept, we demonstrate the simultaneous and independent generation of a real-space broadband vortex or a holographic image alongside resonant momentum-space vortex beams with a narrow bandwidth, which cannot be achieved with conventional methods. Such engineered disorder contributes to vast intrinsic freedoms without adding extra dimensions or compromising the optical flatness. Our findings of real–momentum duality not only lay the foundation for disorder engineering in topological photonics but also open new avenues for optical wavefront shaping, encryption and communications.

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Type
research article
DOI
10.1038/s41586-025-08632-9
Author(s)
Qin, Haoye  

EPFL

Su, Zengping
Zhang, Zhe  

EPFL

Lv, Wenjing
Yang, Zijin
Chen, Weijin
Gao, Xinyue
Wei, Heng
Shi, Yuzhi
Li, Bo  
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Date Issued

2025-02-26

Publisher

Springer Science and Business Media LLC

Published in
Nature
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LWE  
FunderFunding(s)Grant NumberGrant URL

National Natural Science Foundation of China

12474388

National Natural Science Foundation of China

12204264

Shenzhen Science and Technology Innovation Commission

JCYJ20230807111706014

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Available on Infoscience
February 27, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/247305
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