具有梯度性质的电磁特异材料对电磁波反射的调控

摘要

研究"空气/特异材料/理想金属"组成的三明治体系,将梯度性质加入到电磁特异材料层的介电参量中,发现这类结构可以对电磁波具有奇异的调控性质.如果设计材料介电参量的梯度形式,可以使体系对反射波相位具有线性的调控,体系的反射波可变为单一模式的平面波,甚至在某些情况下反射波完全变为表面波.通过数值计算和模拟验证了理论预言.%This work deals with investigating a sandwich structure consisting of air, meta-material and perfect metal among which the permittivity and permeability of metamaterial layer has a gradient distribution. Theoretical analysis revealed such structure can be used to linearly tune the phase of reflected waves. In some special cases, all of reflected waves can be conversed to surface wave. The numerical calculation and model simulation verified the theoretical prediction.