负-零-正折射率超材料板中Dirac点附近的透射带隙、类布拉格反射和Goos-Hänchen位移
Transmission gap, Bragg-like reflection, and Goos-Hänchen shifts near the Dirac point inside a negative-zero-positive index metamaterial slab
摘要：
以负-零-正折射率超材料（NZPIM）中光场的双锥结构实现狄拉克点（DP）为背景，研究了NZPIM平板内的反射、透射和古斯-汉兴（GH）位移.由于线性狄拉克色散，作为频率函数的透射具有间隙，因此相应的反射具有用于完全反射的频率或波长窗口，这类似于一维光子晶体中的布拉格反射。在DP附近，随着波长的增加，透射和反射中的相关GH位移可以从正变为负。当频率远离DP处的频率时，这些负的和正的移位也可以通过传输谐振来增强。这些现象在集成光学和光学器件中具有潜在的应用前景。
英文摘要：
Motivated by the realization of the Dirac point (DP) with a double-cone structure for optical field in the negative-zero-positive index metamaterial (NZPIM), the reflection, transmission, and Goos-Hänchen (GH) shifts inside the NZPIM slab are investigated. Due to the linear Dirac dispersion, the transmission as the function of the frequency has a gap, thus the correspond reflection has a frequency or wavelength window for the perfect reflection, which is similar to the Bragg reflection in the one-dimensional photonic crystals. Near the DP, the associated GH shifts in the transmission and reflection can be changed from positive to negative with increasing the wavelength. These negative and positive shifts can also be enhanced by transmission resonances, when the frequency is far from that at the DP. All these phenomena will lead to some potential applications in the integrated optics and optical devices.
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