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arXiv 0811.1438physics.opticscond-mat.mes-hall
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逐层手征光子晶体中的负群速度

Negative group velocity in layer-by-layer chiral photonic crystals

Kin Hung Fung, Jeffrey Chi Wai Lee, C. T. Chan

摘要:

本文研究了由金属和金属构成的手征光子晶体中光的群速度。通过傅里叶分析给出的扩区方案对能带结构的研究,我们证明了所提出的手征结构中负群速度的存在。的物理机制解释的帮助下,一个简化的模型,有一个解析解。光子能带结构的等频线表明,负群速度可以导致正折射或负折射,这取决于介质界面的取向。我们提出了一种可行的实现这种光子晶体。计算结果与简化模型一致。

英文摘要:

We study the group velocity of light in layer-by-layer chiral photonic crystals composed of dielectrics and metals. Through studying the band structures with an extended-zone scheme that is given by a Fourier analysis, we show the existence of negative group velocity in the proposed chiral structures. The physical mechanism is interpreted with the help of a simplified model that has an analytical solution. The iso-frequency contours of the photonic band structure suggest that the negative group velocity can lead to either positive or negative refraction, depending on the orientation of the medium interface. We propose a feasible realization of such kind of photonic crystals. Computational results on the proposed realization are consistent with that of the simplified models.

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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