Creation of a Two-Dimensional Negative-Index-of-Refraction Material

Danny Tremblay

2007

Metamaterials with an effective negative permittivity, permeability, and consequently a negative index-of-refraction were simulated using an FDTD method. A base geometry consisting of metal wire encased in Mylar with ferrite cross-bridges was created and used to focus divergent light with a wavelength near 7 mm. This created a material with a negative index-of-refraction both parallel and perpendicular to light propagation. The ferrite bridges were then reduced in size, both parallel and perpendicular to light propagation, to observe the effects on transmission and index-of-refraction. When varying the bridge perpendicular to light propagation, index-of-refraction varied from -0.402 � 0.041 to -0.653 ± 0.042 and transmission was maximized at 43.3 GHz. Varying the parallel bridges exhibited a transition between transmission maximas. Bridges less than half of the full-size had maximum transmission at 40.3 GHz where the index-of-refraction varied from -0.752 ± 0.039 to -1.332 � 0.064. Bridges more than half of the full-size had maximum transmission at 42.6 GHz where the index-of-refraction varied from -0.510 ± 0.054 to -0.925 ± 0.041.