Tailoring Phonon Polaritons with a Single-Layer Photonics-Empowered Polaritonic Crystal
Photonic crystals (PhCs) are artificial periodic structures that can compress and control light at the nanoscale. Recently, the emerging van der Waals (vdW) materials with extreme anisotropy exhibit exotic hyperbolic phonon resonances and ray-like propagation. However, localization and manipulation of these hyperbolic phonon polaritons (PhPs) in polaritonic crystals (PoCs) on a scale deeply below the polariton wavelength have remained elusive so far. Here, we experimentally demonstrate tailored PhP localization in a single layer PoC of patterned α-MoO<sub>3</sub>. The biaxial PoCs have a rotation degree of freedom between the lattice orientation and the optical axis of α-MoO<sub>3</sub>. By tailoring the rotation angle, the bandgap exhibits a transition from open to closed at certain wavelengths. Two-dimensional localization of PhPs in these rotated PoCs have been directly revealed in real space by infrared nanoimaging. Our work provides a robust platform to construct polaritonic cavities for ultrastrong light-matter interactions and nanoscale polariton manipulation.
Authors
- Qingdong Ou (ORCID: https://orcid.org/0000-0003-2161-2543)
- Yuanjie Yang (ORCID: https://orcid.org/0000-0001-5901-2872)
- Youning Gong (ORCID: https://orcid.org/0000-0002-8114-8095)
- Guangyuan Si (ORCID: https://orcid.org/0000-0001-6060-2482)
- Jingying Liu (ORCID: https://orcid.org/0000-0001-9691-2327)
- Qing Zhang (ORCID: https://orcid.org/0000-0002-6869-0381)
- Yupeng Zhang (ORCID: https://orcid.org/0000-0003-2351-5579)
- Haoran Lv (ORCID: https://orcid.org/0009-0009-2875-166X)
- Gang Zhong
- Cheng-Wei Qiu (ORCID: https://orcid.org/0000-0001-8193-3125)
Institutions
- Macau University of Science and Technology (MO)
- University of Electronic Science and Technology of China (CN)
- National University of Singapore (SG)
- Shenzhen University (CN)
- Melbourne Centre for Nanofabrication (AU)
- Australian Regenerative Medicine Institute (AU)
- Australian National Fabrication Facility (AU)
- Macao Polytechnic University (MO)
- Monash University (AU)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-03-13
- DOI
- https://doi.org/10.1021/acs.nanolett.5c00281
- Citations
- 3
- Primary Topic
- Plasmonic and Surface Plasmon Research
- Type
- article
- Field-Weighted Citation Impact
- 2.02
Funders
- National Natural Science Foundation of China
- Fundo para o Desenvolvimento das Ciências e da Tecnologia
- Sichuan Province Science and Technology Support Program
- Australian Research Council
- National Key Research and Development Program of China