Subwavelength imaging at infrared frequencies using an array of metallic nanorods

We demonstrate that an array of metallic nanorods enables subwavelength (near-field) imaging at infrared frequencies. Using an homogenization approach, it is theoretically proved that under certain conditions the incoming radiation can be transmitted by the array of nanorods over a significant distance with fairly low attenuation. The propagation mechanism does not involve a resonance of material parameters and thus the resolution is not strongly affected by material losses and has wide bandwidth. The subwavelength imaging with ${\lambda }_0∕10$ resolution by silver rods at $30\mathrm{THz}$ and over a propagating distance of $0.6{\lambda }_0$ is demonstrated numerically using a full-wave electromagnetic simulator.