On metallic gratings coated conformally with isotropic negative-phase-velocity materials

Application of the differential method (also called the C method) to plane-wave diffraction by a perfectly conducting, sinusoidally corrugated metallic grating coated with a linear, homogeneous, isotropic, lossless dielectric–magnetic material shows that coating materials with negative index of refraction may deliver enhanced maximum nonspecular reflection efficiencies in comparison to coating materials with positive index of refraction.

将微分法（也称为C方法）应用于由涂覆有线性、均匀、各向同性、无损耗的电介质 - 磁性材料的理想导电、正弦波纹金属光栅引起的平面波衍射，结果表明，与具有正折射率的涂层材料相比，具有负折射率的涂层材料可能会提供更高的最大非镜面反射效率。