arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1809.03432physics.optics
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一种中红外双轴双曲范德瓦尔斯晶体

A mid-infrared biaxial hyperbolic van der Waals crystal

Zebo Zheng, Ningsheng Xu, Stefano Luigi Oscurato, Michele Tamagnone, Fengsheng Sun, Yinzhu Jiang, Yanlin Ke, Jianing Chen, Wuchao Huang, William L. Wilson, Anto… 展开作者

Zebo Zheng, Ningsheng Xu, Stefano Luigi Oscurato, Michele Tamagnone, Fengsheng Sun, Yinzhu Jiang, Yanlin Ke, Jianing Chen, Wuchao Huang, William L. Wilson, Antonio Ambrosio, Shaozhi Deng, Huanjun Chen

摘要:

双曲介质在光子学界引起了广泛的关注,这要归功于它们将光限制在任意小体积内的能力以及它们在超分辨率应用中的用途。这些介质的2D对应物可以用双曲超颖表面实现,双曲超颖表面由于纳米粒子而支持平面内双曲导模,然而,纳米粒子带来了重大的制造挑战并限制了可实现的限制。我们发现,薄薄片的范德瓦尔斯材料α-MoO 3可以支持自然的平面内双曲偏振激元导模在中红外频率没有任何图案。这是可能的,因为α-MoO 3是双轴双曲晶体,具有三个不同的Restrahlen带,每个带对应不同的晶轴。我们的研究结果可以为在平面光子器件中操纵和限制光的新范式铺平道路。

英文摘要:

Hyperbolic media have attracted much attention in the photonics community, thanks to their ability to confine light to arbitrarily small volumes and to their use for super-resolution applications. The 2D counterpart of these media can be achieved with hyperbolic metasurfaces, which support in-plane hyperbolic guided modes thanks to nanopatterns which, however, pose significant fabrication challenges and limit the achievable confinement. We show that thin flakes of the van der Waals material α-MoO3 can support naturally in-plane hyperbolic polariton guided modes at mid-infrared frequencies without any patterning. This is possible because α-MoO3 is a biaxial hyperbolic crystal, with three different Restrahlen bands, each for a different crystal axis. Our findings can pave the way towards new paradigm to manipulate and confine light in planar photonic devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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