A low loss semi H-shaped negative refractive index metamaterial at 4.725?THz

摘要

We numerically propose a negative refractive index metamaterial structure with a unit cell composed of only one semi H-shaped element. With this structure a very high transmission of ?0.65?dB and a low reflection of ?16.48?dB can be achieved at 4.725?THz, with the real part of the refractive index equal to ?1.9. The FOM of the structure is 89.43, which warrants the quality of the proposed structure for negative refractive index applications.