Moradi Mostafa, Niknam Ali Reza
Opt Lett. 2018 Feb 1;43(3):519-522. doi: 10.1364/OL.43.000519.
Metamaterials in which plasmas are included have significant properties that may not be found in ordinary metamaterials. The permittivity function of these engineered materials can be rapidly manipulated by applying external electric and magnetic field or changing the gas pressure, temperature, and collisional frequency. We investigate the conditions necessary for the existence of Dyakonov surface waves (DSWs) propagating along the interface of a plasma metamaterial (PMM) and an isotropic dielectric material in the terahertz region. We assume the PMM to be a multilayer structure that consists of plasma and background isotropic material alternately. The influence of considering the plasma collisional loss in the DSW dispersion curve is studied. We demonstrate that the angular regions in which the DSW propagation is allowed can be tuned and significantly expanded. We also show that the large birefringence represented by the PMM allows DSWs to exist within large angular existence domains and levels of localization similar to plasmons, thus making these surface waves available for practical applications.
包含等离子体的超材料具有普通超材料所没有的显著特性。通过施加外部电场和磁场或改变气体压力、温度和碰撞频率，这些人工材料的介电常数函数可以被快速调控。我们研究了太赫兹频段沿等离子体超材料（PMM）与各向同性介电材料界面传播的狄亚科诺夫表面波（DSW）存在所需的条件。我们假设PMM为一种由等离子体和背景各向同性材料交替组成的多层结构。研究了在DSW色散曲线中考虑等离子体碰撞损耗的影响。我们证明了允许DSW传播的角区域可以被调控并显著扩展。我们还表明，PMM所表现出的大双折射使得DSW能够在与等离子体激元相似的大角度存在域和局域化水平内存在，从而使这些表面波可用于实际应用。
