期刊
SCIENCE ADVANCES
卷 5, 期 5, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aav8690
关键词
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资金
- National Natural Science Foundation of China [51290271, 11474364, 11874407]
- National Key Basic Research Program of China [2013CB933601]
- National Key Research and Development Program of China [2016YFA0203500]
- Guangdong Natural Science Funds for Distinguished Young Scholars [2014A030306017]
- Pearl River S&T Nova Program of Guangzhou [201610010084]
- Guangdong Special Support Program [201428004]
- Strategic Priority Research Program of Chinese Academy of Science [XDB30000000]
- National Science Foundation [1541959]
- Fondazione Angelo Della Riccia
- program for International Mobility of Researchers of the University of Naples Federico II (Italy)
- Swiss National Science Foundation (SNSF) [177836]
Hyperbolic media have attracted much attention in the photonics community due to their ability to confine light to arbitrarily small volumes and their potential applications to super-resolution technologies. The two-dimensional counterparts of these media can be achieved with hyperbolic metasurfaces that support in-plane hyperbolic guided modes upon nanopatterning, which, however, poses notable fabrication challenges and limits the achievable confinement. We show that thin flakes of a van der Waals crystal, alpha-MoO3, can support naturally in-plane hyperbolic polariton guided modes at mid-infrared frequencies without the need for patterning. This is possible because alpha-MoO3 is a biaxial hyperbolic crystal with three different Reststrahlen bands, each corresponding to a different crystalline axis. These findings can pave the way toward a new paradigm to manipulate and confine light in planar photonic devices.
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