A graphene-based terahertz tunable negative refractive index metasurface has been demonstrated. The proposed metasurface unit-cell comprises of a metallic fractal cross resonant ring and embedded ...

We have investigated microwave active negative refractive index (NRI) transmission line (also named composite right-hand / left-hand transmission line, or CRLH-TL) metamaterials incorporating gain ...

The Chicago Fed National Activity Index ("CFNAI") rose to -0.28 in May from -0.36 in April, according to data released by the Federal Reserve Bank of Chicago on Thursday.