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首页> 外文期刊>Advanced Materials >Phonon Polaritons in Monolayers of Hexagonal Boron Nitride
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Phonon Polaritons in Monolayers of Hexagonal Boron Nitride

机译：六方氮化硼单层中的声子极化子。

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摘要

Phonon polaritons in van der Waals materials reveal significant confinement accompanied with long propagation length: important virtues for tasks pertaining to the control of light and energy flow at the nanoscale. While previous studies of phonon polaritons have relied on relatively thick samples, here reported is the first observation of surface phonon polaritons in single atomic layers and bilayers of hexagonal boron nitride (hBN). Using antenna-based near-field microscopy, propagating surface phonon polaritons in mono- and bilayer hBN microcrystals are imaged. Phonon polaritons in monolayer hBN are confined in a volume about one million times smaller than the free-space photons. Both the polariton dispersion and their wavelength-thickness scaling law are altered compared to those of hBN bulk counterparts. These changes are attributed to phonon hardening in monolayer-thick crystals. The data reported here have bearing on applications of polaritons in metasurfaces and ultrathin optical elements.
机译：范德华材料中的声子极化子显示出显着的限制，且传播距离长：这是控制纳米级光和能量流相关任务的重要优点。尽管先前对声子极化子的研究依赖于相对较厚的样品，但本文报道的是六方氮化硼（hBN）的单原子层和双层中表面声子极化子的首次观察。使用基于天线的近场显微镜，对单层和双层hBN微晶中传播的表面声子极化子进行成像。单层hBN中的声子极化子的体积比自由空间光子小约一百万倍。与hBN本体对应物相比，极化子色散及其波长-厚度比例定律都发生了变化。这些变化归因于单层厚晶体中的声子硬化。此处报道的数据与极化子在超表面和超薄光学元件中的应用有关。

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