Realization of all-band-flat photonic lattices

Jing Yang, Yuanzhen Li, Yumeng Yang, Xinrong Xie, Zijian Zhang, Jiale Yuan, Han Cai, Da-Wei Wang () and Fei Gao ()
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Jing Yang: Zhejiang University
Yuanzhen Li: Zhejiang University
Yumeng Yang: Zhejiang University
Xinrong Xie: Zhejiang University
Zijian Zhang: Zhejiang University
Jiale Yuan: Zhejiang University
Han Cai: Zhejiang University
Da-Wei Wang: Zhejiang University
Fei Gao: Zhejiang University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Flatbands play an important role in correlated quantum matter and have promising applications in photonic lattices. Synthetic magnetic fields and destructive interference in lattices are traditionally used to obtain flatbands. However, such methods can only obtain a few flatbands with most bands remaining dispersive. Here we realize all-band-flat photonic lattices of an arbitrary size by precisely controlling the coupling strengths between lattice sites to mimic those in Fock-state lattices. This allows us to go beyond the perturbative regime of strain engineering and group all eigenmodes in flatbands, which simultaneously achieves high band flatness and large usable bandwidth. We map out the distribution of each flatband in the lattices and selectively excite the eigenmodes with different chiralities. Our method paves a way in controlling band structure and topology of photonic lattices.

Date: 2024
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DOI: 10.1038/s41467-024-45580-w

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