arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1707.09780cond-mat.mes-hallphysics.optics
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蜂窝状光子结构的光学特性

Optical properties of honeycomb photonic structures

Artem D. Sinelnik, Mikhail V. Rybin, Stanislav Y. Lukashenko, Mikhail F. Limonov, Kirill B. Samusev

摘要:

我们研究,理论和实验,不同类型的蜂窝光子结构,也被称为“光子石墨烯”的光学特性。首先,我们采用双光子聚合的方法来制备蜂窝结构。在实验中,我们观察到一个强大的衍射从有限数量的元素,从而提供了一个独特的工具来定义的精确数量的散射元素的结构,通过肉眼。然后,我们从理论上研究了蜂窝单层和二维平行介质圆棒结构的透射谱。当棒材料$\varepsilon$的介电常数增加时,我们揭示了当最低TE ${}_{01}$ Mie带隙在最低布拉格带隙以下打开时,二维光子石墨烯结构转变为超材料。我们还观察到两个狄拉克点的二维光子石墨烯的能带结构中的$K$点的布里渊区和演示的狄拉克透镜TM偏振的表现。狄拉克透镜的性能是,2D光子石墨烯层将来自点源的波转换成具有平坦相位表面的光束,该光束在狄拉克频率下用于TM偏振。

英文摘要:

We study, theoretically and experimentally, optical properties of different types of honeycomb photonic structures, known also as `photonic graphene'. First, we employ the two-photon polymerization method to fabricate the honeycomb structures. In experiment, we observe a strong diffraction from a finite number of elements, thus providing a unique tool to define the exact number of scattering elements in the structure by a naked eye. Then, we study theoretically the transmission spectra of both honeycomb single layer and 2D structures of parallel dielectric circular rods. When the dielectric constant of the rod materials $\varepsilon$ is increasing, we reveal that a two-dimensional photonic graphene structure transforms into a metamaterial when the lowest TE${}_{01}$ Mie gap opens up below the lowest Bragg bandgap. We also observe two Dirac points in the band structure of 2D photonic graphene at the $K$ point of the Brillouin zone and demonstrate a manifestation of the Dirac lensing for the TM polarization. The performance of the Dirac lens is that the 2D photonic graphene layer converts a wave from point source into a beam with flat phase surfaces at the Dirac frequency for the TM polarization.

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