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- Title
Hyperbolic polaritonic crystals with configurable low-symmetry Bloch modes.
- Authors
Lv, Jiangtao; Wu, Yingjie; Liu, Jingying; Gong, Youning; Si, Guangyuan; Hu, Guangwei; Zhang, Qing; Zhang, Yupeng; Tang, Jian-Xin; Fuhrer, Michael S.; Chen, Hongsheng; Maier, Stefan A.; Qiu, Cheng-Wei; Ou, Qingdong
- Abstract
Photonic crystals (PhCs) are a kind of artificial structures that can mold the flow of light at will. Polaritonic crystals (PoCs) made from polaritonic media offer a promising route to controlling nano-light at the subwavelength scale. Conventional bulk PhCs and recent van der Waals PoCs mainly show highly symmetric excitation of Bloch modes that closely rely on lattice orders. Here, we experimentally demonstrate a type of hyperbolic PoCs with configurable and low-symmetry deep-subwavelength Bloch modes that are robust against lattice rearrangement in certain directions. This is achieved by periodically perforating a natural crystal α-MoO3 that hosts in-plane hyperbolic phonon polaritons. The mode excitation and symmetry are controlled by the momentum matching between reciprocal lattice vectors and hyperbolic dispersions. We show that the Bloch modes and Bragg resonances of hyperbolic PoCs can be tuned through lattice scales and orientations while exhibiting robust properties immune to lattice rearrangement in the hyperbolic forbidden directions. Our findings provide insights into the physics of hyperbolic PoCs and expand the categories of PhCs, with potential applications in waveguiding, energy transfer, biosensing and quantum nano-optics. Photonic crystals (PhCs) are artificial periodic materials that can be used to manipulate the flow of light. Here, the authors report the realization of asymmetric PhCs based on in-plane hyperbolic phonon polaritons in perforated α-MoO3, showing low-symmetry deep-subwavelength Bloch modes that are robust against lattice rearrangement in specific directions.
- Subjects
POLARITONS; PHONONS; RIESZ spaces; CRYSTALS; PHOTONIC crystals
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-39543-w