Journal article
Controlling the propagation asymmetry of hyperbolic shear polaritons in beta-gallium oxide
Nature communications, Vol.14(1), 5240
08/28/2023
DOI: 10.1038/s41467-023-40789-7
PMCID: PMC10462611
PMID: 37640711
Abstract
Structural anisotropy in crystals is crucial for controlling light propagation, particularly in the infrared spectral regime where optical frequencies overlap with crystalline lattice resonances, enabling light-matter coupled quasiparticles called phonon polaritons (PhPs). Exploring PhPs in anisotropic materials like hBN and MoO
3
has led to advancements in light confinement and manipulation. In a recent study, PhPs in the monoclinic crystal β-Ga
2
O
3
(bGO) were shown to exhibit strongly asymmetric propagation with a frequency dispersive optical axis. Here, using scanning near-field optical microscopy (s-SNOM), we directly image the symmetry-broken propagation of hyperbolic shear polaritons in bGO. Further, we demonstrate the control and enhancement of shear-induced propagation asymmetry by varying the incident laser orientation and polariton momentum using different sizes of nano-antennas. Finally, we observe significant rotation of the hyperbola axis by changing the frequency of incident light. Our findings lay the groundwork for the widespread utilization and implementation of polaritons in low-symmetry crystals.
Hyperbolic phonon polaritons occurring in anisotropic materials exhibit strong light confinement and propagation directionality. Matson et al. report real-space imaging and control of recently discovered hyperbolic shear phonon-polaritons in beta-Ga2O3, arising from symmetry breaking in the dielectric response.
Details
- Title: Subtitle
- Controlling the propagation asymmetry of hyperbolic shear polaritons in beta-gallium oxide
- Creators
- Joseph Matson - Vanderbilt UniversitySören Wasserroth - Fritz Haber Institute of the Max Planck SocietyXiang Ni - CUNY Advanced Science Research CenterMaximilian Obst - Technische Universität DresdenKatja Diaz-Granados - Vanderbilt UniversityGiulia Carini - Fritz Haber Institute of the Max Planck SocietyEnrico Maria Renzi - CUNY Advanced Science Research CenterEmanuele Galiffi - CUNY Advanced Science Research CenterThomas G. Folland - University of IowaLukas M. Eng - Technische Universität DresdenJ. Michael Klopf - Dresden, GermanyStefan Mastel - Attocube Systems (Germany)Sean Armster - Northrop Grumman (United States)Vincent Gambin - Northrop Grumman (United States)Martin Wolf - Fritz Haber Institute of the Max Planck SocietySusanne C. Kehr - Technische Universität DresdenAndrea Alù - CUNY Advanced Science Research CenterAlexander Paarmann - Fritz Haber Institute of the Max Planck SocietyJoshua D. Caldwell - Vanderbilt University
- Resource Type
- Journal article
- Publication Details
- Nature communications, Vol.14(1), 5240
- DOI
- 10.1038/s41467-023-40789-7
- PMID
- 37640711
- PMCID
- PMC10462611
- NLM abbreviation
- Nat Commun
- ISSN
- 2041-1723
- eISSN
- 2041-1723
- Publisher
- Nature Publishing Group UK
- Grant note
- ; N00014-19-1-2011; N00014-19-1-2011; N00014-19-1-2011 / ; EXC 2147, project-id 390858490; EXC 2147, project-id 390858490; EXC 2147, project-id 390858490 / ; NSF-DMR-1904793 / ; 855344/EG / ; W911NF-21-1-0119 / ;
- Language
- English
- Date published
- 08/28/2023
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984458106002771
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