Unfolded band structures of photonic quasicrystals and moiré superlattices

Zhang, Yanbin; Che, Zhiyuan; Liu, Wenzhe; Wang, Jiajun; Zhao, M. G.; Guan, Fang; Liu, Xiaohan; Shi, Lei; Zi, Jian

doi:10.1103/physrevb.105.165304

Cited by 4 publications

(3 citation statements)

References 67 publications

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“…Finding the high-order BICs and revealing the physical mechanisms beyond the symmetry perspective will help us to have a deep insight into the topological properties of optical BICs. For quasi-BICs in moiré structures and photonic quasicrystals [53,78,86] , more explorations are required to establish the modulation and evolution mechanism. And there are still many degrees of freedom in multilayer compound structures constructed by periodic structures, such as the interlayer coupling [272] , to be explored.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, it was reported by Che et al. that quasi-BICs could also exist in quasiperiodic systems like photonic quasicrystals [53,86] . Photonic quasicrystals can have high rotational symmetry, underlying vortex polarization configurations in momentum space that are similar to symmetry-protected BICs.…”

Section: Explored Effects Enabled By Bicsmentioning

confidence: 99%

“…8(b)]. Besides photonic quasicrystal slabs, moiré structures are also explored for quasi-BICs [78,86] . For example, by twisting two graphene PhC slabs with a special angle, both the quasi-BIC and the flat band could be achieved.…”

Section: Explored Effects Enabled By Bicsmentioning

confidence: 99%

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Phononic twisted moiré lattice with quasicrystalline patterns

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Liu

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et al. 2022

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Twisted moiré lattices (TMLs) are superlattices that usually comprise two identical two-dimensional lattices with a relative twist angle. Depending on the twist angle, periodic and aperiodic patterns are afforded. Recently, flat bands and localized states have been achieved in photonic and phononic TMLs with periodic patterns. However, the physics of phononic TMLs with quasicrystalline patterns still need to be determined. In this Letter, we theoretically and experimentally realize point- and loop-shaped localized states induced by the flat bands in phononic TMLs with quasicrystalline patterns. The flat bands in our phononic TML do not occur due to the hybridization of the bands near the Dirac point. They evolve from the trivial bands; trivial bands flatten in wide bandgaps due to strong interlayer couplings, yielding flat bands. As the average group velocity of flat bands can be extremely close to zero, the localized states can be bounded in the moiré points and the moiré loops of phononic TMLs with quasicrystalline patterns. Our findings provide a method for manipulating classical waves in various moiré structures with quasicrystalline patterns.

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Unfolded band structures of photonic quasicrystals and moiré superlattices

Cited by 4 publications

References 67 publications

Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications

Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications

Applications of bound states in the continuum in photonics

Phononic twisted moiré lattice with quasicrystalline patterns

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