期刊
SCIENCE
卷 359, 期 6378, 页码 892-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaq1704
关键词
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资金
- European Commission under the Graphene Flagship (GrapheneCore1) [696656]
- Marie Sklodowska-Curie individual fellowship [SGPCM-705960]
- Spanish Ministry of Economy, Industry, and Competitiveness [MAT2015-65525-R, MAT2015-65159-R, FIS2014-60195-JIN, MAT2014-53432-C5-4-R, FIS2016-80174-P, MAT2017-88358-C3-3-R, MDM-2016-0618]
- Basque government [PRE-2016-1-0150]
- Regional Council of Gipuzkoa [100/16]
- Department of Industry of the Basque Government [MICRO4FA]
- Materials Engineering and Processing program of the NSF [CMMI 1538127]
- II-VI Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1538127] Funding Source: National Science Foundation
Metasurfaces with strongly anisotropic optical properties can support deep subwavelength-scale confined electromagnetic waves (polaritons), which promise opportunities for controlling light in photonic and optoelectronic applications. We developed a mid-infrared hyperbolic metasurface by nanostructuring a thin layer of hexagonal boron nitride that supports deep subwavelength-scale phonon polaritons that propagate with in-plane hyperbolic dispersion. By applying an infrared nanoimaging technique, we visualize the concave (anomalous) wavefronts of a diverging polariton beam, which represent a landmark feature of hyperbolic polaritons. The results illustrate how near-field microscopy can be applied to reveal the exotic wavefronts of polaritons in anisotropic materials and demonstrate that nanostructured van der Waals materials can form a highly variable and compact platform for hyperbolic infrared metasurface devices and circuits.
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