Indefinite permittivity and negative refraction in natural material: Graphite

Indefinite permittivity and negative refraction in natural material: Graphite
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天然材料中的不定介电常数和负折射:石墨

DOI:
10.1063/1.3562033
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发表时间:
2011-03
影响因子:
4
通讯作者:
Kang, Feiyu
Kang, Feiyu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Sun, Jingbo;Zhou, Ji;Li, Bo;Kang, Feiyu

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在本工作中,我们报道了一种在紫外区呈现负群折射的自然不定介电常数的石墨晶体。在254 nm波长下,由椭偏测量数据得到了双曲线等值线,并从实验上验证了全角度负折射。不确定的介电常数归因于晶体结构中极强的各向异性和混合电子跃迁。这一结果不仅探索了一条通往天然负折射率材料的道路,而且还有望实现紫外超透镜,这可能会导致下一代电子产品的纳米光刻技术的突破。
In this work, we report a nature indefinite permittivity in crystalline graphite that exhibits negative group refraction at ultraviolet region. A hyperbolic equifrequency contour was obtained from ellipsometry data at 254 nm and an all angle negative refraction was verified experimentally. The indefinite permittivity is attributed to extremely strong anisotropy in the crystal structure and the hybrid electronic transitions. This result not only explores a route toward natural negative-index materials, but also holds a promise for ultraviolet hyperlens, which may lead to a breakthrough in nanolithography for the next generation of electronics.
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