New negative index material and experimental verification of exceeding diffraction limit

A two-dimensional negative index material is proposed. It has volumetric structure composed of prism cells with metal bands and wires. The Bloch impedance can be made equal to 120π by parametric studies, and an incident plane wave goes into the material with low reflection. A negative index plane lens is fabricated to measure the field distribution of wave out of the lens. The refocused field profile is shown to be thinner than the diffraction-limited field profile.