(Optical Society of America, 2008) Beruete Díaz, Miguel; Navarro Cía, Miguel; Sorolla Ayza, Mario; Campillo, Igor; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
This work presents the design of a planoconcave parabolic
negative index metamaterial lens operating at millimeter wavelengths
fabricated by using stacked subwavelength hole arrays. A staircase
approximation to the ideal parabola profile has been done by removing step
by step one lattice in each dimension of the transversal section. Theory
predicts power concentration at the focal point of the parabola when the
refractive index equals -1. Both simulation and measurement results exhibit
an excellent agreement and an asymmetrical focus has been observed. The
possibility to design similar planoconcave devices in the terahertz and
optical wavelengths could be a reality in the near future.
